Update maven.yml

Updated actions to v4.

Author: ksbrwsk

.github/workflows/maven.yml

@@ -15,13 +15,13 @@ jobs:
       with:
         ref: master
     - name: Cache local Maven repository
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ~/.m2/repository
         key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
         restore-keys: ${{ runner.os }}-maven-
     - name: Set up JDK 21
-      uses: actions/setup-java@v3
+      uses: actions/setup-java@v4
       with:
         distribution: 'temurin'
         java-version: '21'