Specify required distribution for setup-java action

Also:
- Update Java version to 25
- Quote java-version and python-version strings
- Cache maven and pip dependencies

Author: nsoranzo

.github/workflows/maven.yml

@@ -9,18 +9,21 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v6
       with:
-        python-version: 3.9
+        python-version: '3.9'
+        cache: 'pip'
     - name: Install Python dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install -r requirements.txt -r dev-requirements.txt
+        python -m pip install -r requirements.txt -r dev-requirements.txt
     - name: Run Python tests to generate workflow examples.
       run: |
         pytest tests/test_lint.py tests/test_cytoscape.py
     - name: Set up JDK
       uses: actions/setup-java@v5
       with:
-        java-version: 11.0.x
+        distribution: 'temurin'
+        java-version: '25'
+        cache: 'maven'
     - name: Run Java maven (mvn) tests for generated workflow examples.
       run: |
         cd java