update: 2025.12.1 -> 2025.12.3

Closes #90 ChangeLogs: * https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.2 * https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.3 Using the `client-go` library that is vendored in this release's `go.mod` breaks all outposts for me, so we're now doing what upstream is also doing, i.e. generating the Go client code ourselves. cc @riotbib @MarcelCoding