ci: bump DeterminateSystems/update-flake-lock from 24 to 25

Bumps [DeterminateSystems/update-flake-lock](https://github.com/determinatesystems/update-flake-lock) from 24 to 25.
- [Release notes](https://github.com/determinatesystems/update-flake-lock/releases)
- [Commits](https://github.com/determinatesystems/update-flake-lock/compare/v24...v25)

---
updated-dependencies:
- dependency-name: DeterminateSystems/update-flake-lock
  dependency-version: '25'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/update-flake.yml

@@ -27,7 +27,7 @@ jobs:
           permission-contents: write
           permission-pull-requests: write
 
-      - uses: DeterminateSystems/update-flake-lock@v24
+      - uses: DeterminateSystems/update-flake-lock@v25
         with:
           token: ${{ steps.generate-token.outputs.token }}
           branch: update_flake_lock_action_${{ matrix.branch }}