Update actions/checkout action to v4

.github/workflows/branches-and-prs.yml

@@ -46,7 +46,7 @@ jobs:
             variant: '4.0'
             java: '8'
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           # Codecov needs fetch-depth > 1
           fetch-depth: 2

.github/workflows/codeql-analysis.yml

@@ -24,7 +24,7 @@ jobs:
         variant: [ '2.5', '3.0', '4.0' ]
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       # Manually added:  Install and setup JDK
       - name: 'Set up JDKs'

.github/workflows/gradle-wrapper-validation.yml

@@ -6,5 +6,5 @@ jobs:
     name: "Validation"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: gradle/wrapper-validation-action@v1

.github/workflows/release.yml

@@ -41,7 +41,7 @@ jobs:
             variant: '4.0'
             java: '8'
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           # Codecov needs fetch-depth > 1
           fetch-depth: 2
@@ -72,7 +72,7 @@ jobs:
         variant: [ '2.5', '3.0', '4.0' ]   # publish needs to be done for all versions
         java: [ '8' ]               # publish needs the min supported java version
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: 'Set up JDKs'
         uses: ./.github/actions/setup-build-env
         with:
@@ -99,7 +99,7 @@ jobs:
         variant: ['4.0']      # docs need the highest variant
         java: ['17']          # docs need the highest java version
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: 'Set up JDKs'
         uses: ./.github/actions/setup-build-env
         with: