Update CI workflow actions and Java distribution

- Update actions/checkout v4 to v6, actions/setup-java v3 to v5, actions/cache v3 to v5
- Switch Java distribution from zulu to temurin
- Add JDK 25 to the test matrix

Author: filiphr

.github/workflows/main.yml

@@ -14,15 +14,15 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        java: [17, 21]
+        java: [17, 21, 25]
     steps:
-    - uses: actions/checkout@v4
-    - uses: actions/setup-java@v3
+    - uses: actions/checkout@v6
+    - uses: actions/setup-java@v5
       with:
-        distribution: 'zulu'
+        distribution: 'temurin'
         java-version: ${{ matrix.java }}
     - name: Cache Maven Repository
-      uses: actions/cache@v3
+      uses: actions/cache@v5
       with:
         path: ~/.m2
         key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}