Upgrade: Bump the actions group with 4 updates (#528)

Bumps the actions group with 4 updates: [OpenTTD/actions](https://github.com/openttd/actions), [OpenTTD/actions/.github/workflows/rw-entry-preview-docker-nomad.yml](https://github.com/openttd/actions), [OpenTTD/actions/.github/workflows/rw-entry-release-docker-nomad.yml](https://github.com/openttd/actions) and [OpenTTD/actions/.github/workflows/rw-entry-testing-docker-py.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-preview-docker-nomad.yml` 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-docker-nomad.yml` from 5 to 6
- [Release notes](https://github.com/openttd/actions/releases)
- [Commits](OpenTTD/actions@v5...v6)

Updates `OpenTTD/actions/.github/workflows/rw-entry-testing-docker-py.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-preview-docker-nomad.yml
  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-docker-nomad.yml
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: OpenTTD/actions/.github/workflows/rw-entry-testing-docker-py.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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/commit-checker.yml

@@ -15,7 +15,7 @@ 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/preview.yml

@@ -12,7 +12,7 @@ jobs:
   preview:
     if: ${{ (github.event.action == 'labeled' && github.event.label.name == 'preview') || (github.event.action != 'labeled' && contains(github.event.pull_request.labels.*.name, 'preview')) }}
     name: Preview
-    uses: OpenTTD/actions/.github/workflows/rw-entry-preview-docker-nomad.yml@v5
+    uses: OpenTTD/actions/.github/workflows/rw-entry-preview-docker-nomad.yml@v6
     secrets: inherit
     with:
       service: bananas-api-preview

.github/workflows/release.yml

@@ -8,7 +8,7 @@ on:
 jobs:
   release:
     name: Release
-    uses: OpenTTD/actions/.github/workflows/rw-entry-release-docker-nomad.yml@v5
+    uses: OpenTTD/actions/.github/workflows/rw-entry-release-docker-nomad.yml@v6
     secrets: inherit
     with:
       service: bananas-api-prod

.github/workflows/testing.yml

@@ -11,7 +11,7 @@ on:
 jobs:
   testing:
     name: Testing
-    uses: OpenTTD/actions/.github/workflows/rw-entry-testing-docker-py.yml@v5
+    uses: OpenTTD/actions/.github/workflows/rw-entry-testing-docker-py.yml@v6
     with:
       python-path: bananas_api
       python-version: 3.11