Chore(deps): Bump actions/checkout from 3.6.0 to 4.1.1

Bumps [actions/checkout](https://github.com/actions/checkout) from 3.6.0 to 4.1.1.
- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](https://github.com/actions/checkout/compare/v3.6.0...v4.1.1)

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

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

.github/workflows/phpunit-mysql.yml

@@ -72,14 +72,14 @@ jobs:
           echo "APP_NAME=${GITHUB_REPOSITORY##*/}" >> $GITHUB_ENV
 
       - name: Checkout server
-        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
         with:
           submodules: true
           repository: nextcloud/server
           ref: ${{ matrix.server-versions }}
 
       - name: Checkout app
-        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
         with:
           path: apps/${{ env.APP_NAME }}