Upgrade: Bump the actions group with 2 updates

Bumps the actions group with 2 updates: [OpenTTD/actions](https://github.com/openttd/actions) and [OpenTTD/actions/.github/workflows/rw-entry-release-baseset.yml](https://github.com/openttd/actions).


Updates `OpenTTD/actions` from 5 to 6
- [Release notes](https://github.com/openttd/actions/releases)
- [Commits](OpenTTD/actions@v5...v6)

Updates `OpenTTD/actions/.github/workflows/rw-entry-release-baseset.yml` from 5 to 6
- [Release notes](https://github.com/openttd/actions/releases)
- [Commits](OpenTTD/actions@v5...v6)

---
updated-dependencies:
- dependency-name: OpenTTD/actions
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: OpenTTD/actions/.github/workflows/rw-entry-release-baseset.yml
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
...

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

Author: dependabot[bot]

.github/workflows/commit-checker.yml

@@ -19,7 +19,7 @@ jobs:
         fetch-depth: 4
 
     - name: Get pull-request commits
-      uses: OpenTTD/actions/checkout-pull-request@v5
+      uses: OpenTTD/actions/checkout-pull-request@v6
 
     - name: Check commits
       uses: OpenTTD/OpenTTD-git-hooks@main

.github/workflows/release.yml

@@ -11,7 +11,7 @@ on:
 jobs:
   release:
     name: Release
-    uses: OpenTTD/actions/.github/workflows/rw-entry-release-baseset.yml@v5
+    uses: OpenTTD/actions/.github/workflows/rw-entry-release-baseset.yml@v6
     secrets: inherit
     with:
       apt-packages: git