Bump the submodules group with 2 updates

Bumps the submodules group with 2 updates: [thirdparty/imgui](https://github.com/ocornut/imgui) and [thirdparty/nghttp2](https://github.com/nghttp2/nghttp2). Updates `thirdparty/imgui` from `fe09ebb` to `5e7dc72` <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/ocornut/imgui/commit/5e7dc72c926b489450e9ea82ea62fd3a6432d5aa"><code>5e7dc72</code></a> Examples: SDL3: Update readme to use SDL3_DIR (<a href="https://redirect.github.com/ocornut/imgui/issues/7846">#7846</a>)</li> <li><a href="https://github.com/ocornut/imgui/commit/fd57b252ac1932760160947ca82b55b884f92600"><code>fd57b25</code></a> Examples: Fix for Emscripten. GLFW+WGPU: rework examples main loop to handle ...</li> <li><a href="https://github.com/ocornut/imgui/commit/71ee2ce3673c8182871cb0b8554f9caf089a5334"><code>71ee2ce</code></a> Examples: GLFW: rework examples main loop to handle minimization without burn...</li> <li><a href="https://github.com/ocornut/imgui/commit/887478793b8f61c5385131d823dbb8ad8e8e900f"><code>8874787</code></a> Examples: SDL2 (all), SDL3 (all), Win32+OpenGL3: Rework examples main loop to...</li> <li><a href="https://github.com/ocornut/imgui/commit/dcf54782d4be1070bab4821f06cdaf9181bfc528"><code>dcf5478</code></a> Version 1.91.WIP</li> <li><a href="https://github.com/ocornut/imgui/commit/8199457a7d9e453f8d3d9cadc14683fb54a858b5"><code>8199457</code></a> Version 1.91.0</li> <li><a href="https://github.com/ocornut/imgui/commit/ec9a4ef487acde06cf1840b1b13310a6c0ba7d62"><code>ec9a4ef</code></a> Clipper: accept that no item have been submitted if in indeterminate Begin(IN...</li> <li><a href="https://github.com/ocornut/imgui/commit/1b44e4044491b96c7bc30989f8d8c356bc57bada"><code>1b44e40</code></a> Demo: re-use tree data. Fix property editor vertical alignment. Tweak recent ...</li> <li><a href="https://github.com/ocornut/imgui/commit/1f634f1d94e16feb3d0b15ad79e8bc44cccc184d"><code>1f634f1</code></a> Eaxmples: Android: Fix build failed issue. (<a href="https://redirect.github.com/ocornut/imgui/issues/7832">#7832</a>)</li> <li><a href="https://github.com/ocornut/imgui/commit/ce3a8d7c79f2490b7db1a55f19030654f9a6f600"><code>ce3a8d7</code></a> Demo: MultiSelect: added tree demo. (<a href="https://redirect.github.com/ocornut/imgui/issues/6990">#6990</a>, <a href="https://redirect.github.com/ocornut/imgui/issues/3823">#3823</a>, <a href="https://redirect.github.com/ocornut/imgui/issues/1861">#1861</a>)</li> <li>Additional commits viewable in <a href="https://github.com/ocornut/imgui/compare/fe09ebbe0a1c8bb5f39f326658faa6bde75bb568...5e7dc72c926b489450e9ea82ea62fd3a6432d5aa">compare view</a></li> </ul> </details> <br /> Updates `thirdparty/nghttp2` from `1308640` to `d9e846a` <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/nghttp2/nghttp2/commit/d9e846a2bd194f50e01773fc79acd7c7c36a293f"><code>d9e846a</code></a> Merge pull request <a href="https://redirect.github.com/nghttp2/nghttp2/issues/2224">#2224</a> from nghttp2/undef-no-ssize-t</li> <li><a href="https://github.com/nghttp2/nghttp2/commit/525830b87a4cb332edf60635a1507d382c5f3680"><code>525830b</code></a> Undefine NGHTTP2_NO_SSIZE_T if BUILDING_NGHTTP2 is defined</li> <li>See full diff in <a href="https://github.com/nghttp2/nghttp2/compare/13086404f7430d81dcd00f0a4a2de458d31e91a0...d9e846a2bd194f50e01773fc79acd7c7c36a293f">compare view</a></li> </ul> </details> <br /> Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`. [//]: # (dependabot-automerge-start) [//]: # (dependabot-automerge-end) --- <details> <summary>Dependabot commands and options</summary> <br /> You can trigger Dependabot actions by commenting on this PR: - `@dependabot rebase` will rebase this PR - `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it - `@dependabot merge` will merge this PR after your CI passes on it - `@dependabot squash and merge` will squash and merge this PR after your CI passes on it - `@dependabot cancel merge` will cancel a previously requested merge and block automerging - `@dependabot reopen` will reopen this PR if it is closed - `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually - `@dependabot show <dependency name> ignore conditions` will show all of the ignore conditions of the specified dependency - `@dependabot ignore <dependency name> major version` will close this group update PR and stop Dependabot creating any more for the specific dependency's major version (unless you unignore this specific dependency's major version or upgrade to it yourself) - `@dependabot ignore <dependency name> minor version` will close this group update PR and stop Dependabot creating any more for the specific dependency's minor version (unless you unignore this specific dependency's minor version or upgrade to it yourself) - `@dependabot ignore <dependency name>` will close this group update PR and stop Dependabot creating any more for the specific dependency (unless you unignore this specific dependency or upgrade to it yourself) - `@dependabot unignore <dependency name>` will remove all of the ignore conditions of the specified dependency - `@dependabot unignore <dependency name> <ignore condition>` will remove the ignore condition of the specified dependency and ignore conditions </details>