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](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>

.github/workflows/on-branch-push-or-pull-request.yml

@@ -16,7 +16,7 @@ jobs:
 
       # ================================================================================================================
       - name: Retrieve the sources
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       # ================================================================================================================
       - name: Build, run tests and deploy locally

.github/workflows/on-development-push-publish-snapshot-and-website.yml

@@ -28,7 +28,7 @@ jobs:
 
       # ================================================================================================================
       - name: Retrieve the sources
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       # ================================================================================================================
       - name: GPG Setup

.github/workflows/on-tag-push-create-release.yml

@@ -28,7 +28,7 @@ jobs:
 
       # ================================================================================================================
       - name: Retrieve the sources
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       # ================================================================================================================
       - name: GPG Setup