chore(ci.deps): bump DeterminateSystems/flake-checker-action

Bumps the actions-dependencies group with 1 update: [DeterminateSystems/flake-checker-action](https://github.com/determinatesystems/flake-checker-action).


Updates `DeterminateSystems/flake-checker-action` from 12 to 13
- [Release notes](https://github.com/determinatesystems/flake-checker-action/releases)
- [Commits](DeterminateSystems/flake-checker-action@v12...v13)

---
updated-dependencies:
- dependency-name: DeterminateSystems/flake-checker-action
  dependency-version: '13'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions-dependencies
...

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

Author: dependabot[bot]

.github/workflows/cron.yml

@@ -127,7 +127,7 @@ jobs:
 
       - name: Check Nix flake inputs
         if: steps.gate.outputs.run == 'true'
-        uses: DeterminateSystems/flake-checker-action@v12
+        uses: DeterminateSystems/flake-checker-action@v13
         with:
           ignore-missing-flake-lock: false
           fail-mode: true