feat: adapt workflow to use java 17 and 21

Author: khammers-metaeffekt

.github/workflows/maven.yml

@@ -1,7 +1,7 @@
 # This workflow will build a Java project with Maven, and cache/restore any dependencies to improve the workflow execution time
 # For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven
 
-name: Java 8 / Java 11 Build with Maven
+name: Java 17 / Java 21 Build with Maven
 
 on:
   push:
@@ -14,7 +14,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        java: [ '8', '11' ]
+        java: [ '17', '21' ]
         os: [ 'ubuntu-latest', 'macos-latest', 'windows-latest' ]
     name: Java ${{ matrix.Java }} (${{ matrix.os }}) sample
     steps: