Bump actions/checkout from 4 to 5 in the gh-actions group

Bumps the gh-actions group with 1 update: [actions/checkout](https://github.com/actions/checkout).


Updates `actions/checkout` from 4 to 5
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: gh-actions
...

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

Author: dependabot[bot]

.github/workflows/codeql-analysis.yml

@@ -24,7 +24,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/linter.yml

@@ -6,7 +6,7 @@ jobs:
   linter:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Set up Node.js 23.x
         uses: actions/setup-node@v4
         with:

.github/workflows/test-autoupdate-action.yml

@@ -15,10 +15,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout this repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Checkout target repo (autoupdate-action-unstable)
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: CSSUoB/autoupdate-action-unstable
           token: ${{ secrets.PR_AUTO_UPDATE_TOKEN }}

.github/workflows/tests.yml

@@ -8,7 +8,7 @@ jobs:
     permissions:
       id-token: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Set up Node.js 23.x
         uses: actions/setup-node@v4
         with: