Upgrade: Bump the actions group across 1 directory with 3 updates (#686)

Bumps the actions group with 3 updates in the / directory: [actions/checkout](https://github.com/actions/checkout), [OpenTTD/actions](https://github.com/openttd/actions) and [actions/setup-python](https://github.com/actions/setup-python).


Updates `actions/checkout` from 5 to 6
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

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

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

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: OpenTTD/actions
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: actions/setup-python
  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

@@ -10,12 +10,12 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         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/new_comment.yml

@@ -13,9 +13,9 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Set up Python 3.8
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: 3.8
         cache: 'pip'

.github/workflows/new_issue.yml

@@ -13,9 +13,9 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Set up Python 3.8
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: 3.8
         cache: 'pip'

.github/workflows/testing.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Flake8
       uses: TrueBrain/actions-flake8@v2
       with:
@@ -25,9 +25,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Set up Python 3.8
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: 3.8
     - name: Black
@@ -48,4 +48,4 @@ jobs:
 
     steps:
     - name: Check annotations
-      uses: OpenTTD/actions/annotation-check@v5
+      uses: OpenTTD/actions/annotation-check@v6