Update CI setup-java and remove dead build

Author: headius

.github/workflows/ci.yml

@@ -10,28 +10,21 @@ on:
     branches: [ master ]
 
 jobs:
-  jdk8:
+  test:
 
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v2
-    - name: Set up JDK 8
-      uses: actions/setup-java@v1.4.3
-      with:
-        java-version: 8
-    - name: Run tests
-      run: mvn test --file pom.xml
-
-  jdk11:
+    strategy:
+      matrix:
+        java-version: [8, 11, 17, 21, 25]
 
     runs-on: ubuntu-latest
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up JDK 11
-      uses: actions/setup-java@v1.4.3
+    - name: Set up JDK ${{ matrix.java-version }}
+      uses: actions/setup-java@v5
       with:
-        java-version: 11
+        distribution: 'temurin'
+        java-version: ${{ matrix.java-version }}
+        cache: 'maven'
     - name: Run tests
-      run: mvn test --file pom.xml
+      run: mvn test --file pom.xml