build(deps): bump actions/checkout from 3 to 4

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](https://github.com/actions/checkout/compare/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>

.github/workflows/unit_tests.yml

@@ -16,7 +16,7 @@ jobs:
         username: ${{ github.repository_owner }}
         password: ${{ secrets.GITHUB_TOKEN }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Validate composer.json and composer.lock
       run: composer validate
     - name: Install dependencies
@@ -27,7 +27,7 @@ jobs:
   Sqlite-PHP8:
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Validate composer.json and composer.lock
       run: composer validate
     - name: Install dependencies
@@ -57,7 +57,7 @@ jobs:
           --health-timeout 5s
           --health-retries 5
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Validate composer.json and composer.lock
       run: composer validate
     - name: Install dependencies
@@ -98,7 +98,7 @@ jobs:
         - 1433:1433
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: install php and database client packages
       run: |
         sudo apt-get update