chore(deps): bump actions/checkout from 3 to 4 (#420)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/standards-and-tests.yml

@@ -30,7 +30,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Start required services
         run: sudo systemctl start mysql.service

.github/workflows/update-pot.yml

@@ -13,7 +13,7 @@ jobs:
   update-pot:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Setup PHP with tools
       uses: shivammathur/setup-php@v2
       with:

.github/workflows/update-translations.yml

@@ -6,7 +6,7 @@ jobs:
   update-translations:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         token: ${{ secrets.PAT_FOR_GITHUB_ACTIONS }}
     - name: Install Transifex Client