Update actions/checkout action to v6 (#144)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/build.yml

@@ -41,7 +41,7 @@ jobs:
 
       # Check out the current repository
       - name: Fetch Sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       # Set up the Java environment for the next steps
       - name: Setup Java
@@ -92,7 +92,7 @@ jobs:
 
       # Check out the current repository
       - name: Fetch Sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       # Set up the Java environment for the next steps
       - name: Setup Java
@@ -147,7 +147,7 @@ jobs:
 
       # Check out the current repository
       - name: Fetch Sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: ${{ github.event.pull_request.head.sha }}  # to check out the actual pull request commit, not the merge commit
           fetch-depth: 0  # a full history is required for pull request analysis
@@ -187,7 +187,7 @@ jobs:
 
       # Check out the current repository
       - name: Fetch Sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       # Set up the Java environment for the next steps
       - name: Setup Java
@@ -227,7 +227,7 @@ jobs:
 
       # Check out the current repository
       - name: Fetch Sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       # Remove old release drafts by using the curl request for the available releases with a draft flag
       - name: Remove Old Release Drafts

.github/workflows/release.yml

@@ -27,7 +27,7 @@ jobs:
 
       # Check out the current repository
       - name: Fetch Sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: ${{ github.event.release.tag_name }}
 

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

@@ -33,7 +33,7 @@ jobs:
 
       # Check out the current repository
       - name: Fetch Sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       # Set up the Java environment for the next steps
       - name: Setup Java