Upgrade to v4

Author: PhilWakelin

.github/workflows/java.yml

@@ -18,9 +18,9 @@ jobs:
         jdk: [8, 11, 17]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up JDK ${{ matrix.jdk }}
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           java-version: ${{ matrix.jdk }}
           distribution: "semeru"
@@ -37,9 +37,9 @@ jobs:
          jdk: [8, 11, 17]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up JDK ${{ matrix.jdk }}
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           java-version: ${{ matrix.jdk }}
           distribution: "semeru"
@@ -71,7 +71,7 @@ jobs:
           - name: Build with Gradle
             run: gradle build bootWar -Pjava_version=${{ matrix.jdk }}
 
-            
+
   build-gradlew:
     name: Build Gradle wrapper