Update flake.lock

Automated changes by the [update-flake-lock](https://github.com/DeterminateSystems/update-flake-lock) GitHub Action. ``` Flake lock file updates: • Updated input 'fenix': 'https://api.flakehub.com/f/pinned/nix-community/fenix/0.1.2342%2Brev-451f184de2958f8e725acba046ec10670dd771a1/019864bb-9457-74e4-91eb-576a61bf0c54/source.tar.gz?narHash=sha256-EA7Qh5OUc3tgYrLHfG7zU6wxltvWsJ0%2BsFxOcVsbjOY%3D' (2025-08-01) → 'https://api.flakehub.com/f/pinned/nix-community/fenix/0.1.2375%2Brev-113eba389317407992ea219d5aaced44bf6407f9/0199045f-8452-723d-b201-deb22d41c75e/source.tar.gz?narHash=sha256-xv2u5dnQpdWkrIy5TBSomr055odWtRSoECSGBzNpp3w%3D' (2025-09-01) • Updated input 'fenix/rust-analyzer-src': 'github:rust-lang/rust-analyzer/68e7ec90bf29c9b17d0dcdb3358de5dee7f4afb5?narHash=sha256-Ya4Ecj8JaKkapgYCCybzZBcypXpblhuG0hVDzdy2zyo%3D' (2025-07-31) → 'github:rust-lang/rust-analyzer/21614ed2d3279a9aa1f15c88d293e65a98991b30?narHash=sha256-wfaKRKsEVQDB7pQtAt04vRgFphkVscGRpSx3wG1l50E%3D' (2025-08-30) • Updated input 'nixpkgs': 'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.2505.808723%2Brev-b1b3291469652d5a2edb0becc4ef0246fff97a7c/0198daf7-011a-7703-95d7-57146e794342/source.tar.gz?narHash=sha256-wY1%2B2JPH0ZZC4BQefoZw/k%2B3%2BDowFyfOxv17CN/idKs%3D' (2025-08-23) → 'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.2505.809451%2Brev-fe83bbdde2ccdc2cb9573aa846abe8363f79a97a/01991994-e87c-727b-9735-22e63d4303e6/source.tar.gz?narHash=sha256-PLoSjHRa2bUbi1x9HoXgTx2AiuzNXs54c8omhadyvp0%3D' (2025-09-04) ``` ### Running GitHub Actions on this PR GitHub Actions will not run workflows on pull requests which are opened by a GitHub Action. **To run GitHub Actions workflows on this PR, close and re-open this pull request.**