[CI skip] Update actions/checkout action to v4

.github/workflows/discord-webhook.yml

@@ -21,7 +21,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3.6.0
+      uses: actions/checkout@v4.1.0
 
     - name: Set up Java JDK 17
       uses: actions/setup-java@v3.13.0

.github/workflows/json-validator.yml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
     - name: Checkout Repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Validate wiki.json
       uses: docker://orrosenblatt/validate-json-action:latest@sha256:02370758b8b199e0477da11ecfdd498c75c561685056b5c31b925a4ab95df7f4
       env:

.github/workflows/maven-compiler.yml

@@ -25,7 +25,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Set up JDK 17
       uses: actions/setup-java@v3.13.0

.github/workflows/pull-request.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Set up JDK 17
       uses: actions/setup-java@v3.13.0

.github/workflows/release-candidates.yml

@@ -19,7 +19,7 @@ jobs:
     steps:
 
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         ref: 'stable'
 

.github/workflows/sonarcloud.yml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.1.0
         with:
           fetch-depth: 0
 

.github/workflows/yaml-linter.yml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: YAML Linter
       uses: ibiqlik/action-yamllint@v3.1.1
       with: