Bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/build.yml

@@ -34,7 +34,7 @@ jobs:
 
       # Check out current repository
       - name: Fetch Sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       # Validate wrapper
       - name: Gradle Wrapper Validation
@@ -73,7 +73,7 @@ jobs:
 
       # Check out current repository
       - name: Fetch Sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       # Set up Java environment for the next steps
       - name: Setup Java
@@ -126,7 +126,7 @@ jobs:
 
       # Check out current repository
       - name: Fetch Sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       # Set up Java environment for the next steps
       - name: Setup Java
@@ -157,7 +157,7 @@ jobs:
 
       # Check out current repository
       - name: Fetch Sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       # Set up Java environment for the next steps
       - name: Setup Java
@@ -197,7 +197,7 @@ jobs:
 
       # Check out current repository
       - name: Fetch Sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       # Set up Java environment for the next steps
       - name: Setup Java

.github/workflows/release.yml

@@ -20,7 +20,7 @@ jobs:
 
       # Check out current repository
       - name: Fetch Sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: ${{ github.event.release.tag_name }}
 

.github/workflows/run-ui-tests.yml

@@ -33,7 +33,7 @@ jobs:
 
       # Check out current repository
       - name: Fetch Sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       # Set up Java environment for the next steps
       - name: Setup Java