github: workflows: bump DeterminateSystems/update-flake-lock

Bumps [DeterminateSystems/update-flake-lock](https://github.com/determinatesystems/update-flake-lock) from 23 to 25.
- [Release notes](https://github.com/determinatesystems/update-flake-lock/releases)
- [Commits](DeterminateSystems/update-flake-lock@v23...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] <[email protected]>

Author: dependabot[bot]

.github/workflows/nix_flake_update.yml

@@ -20,7 +20,7 @@ jobs:
       - uses: DeterminateSystems/nix-installer-action@v13
       - uses: DeterminateSystems/magic-nix-cache-action@v7
 
-      - uses: DeterminateSystems/update-flake-lock@v23
+      - uses: DeterminateSystems/update-flake-lock@v25
         with:
           pr-labels: dependencies
           pr-title: "flake: inputs: update all"