update to maven build action and java 21

.github/workflows/build.yml

@@ -0,0 +1,33 @@
+
+name: Java CI with Maven
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+permissions:
+  security-events: write
+  contents: write
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        # test against latest update of each major Java version, as well as specific updates of LTS versions:
+        java: [ 17, 21 ]
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up JDK
+      uses: actions/setup-java@v3
+      with:
+        java-version: ${{ matrix.java }}
+        distribution: 'liberica'
+    - name: Build with Maven
+      run: mvn -B package --file pom.xml
+    - name: Maven Dependency Tree Dependency Submission
+      uses: advanced-security/[email protected]