Update java versions

Author: laurynas

.github/workflows/main.yml

@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java-version: [ 11, 17 ]
+        java-version: [ 11, 17, 21 ]
     steps:
       - uses: actions/checkout@v3
       - name: Set up JDK ${{ matrix.java-version }}
@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java-release: [ 17 ]
+        java-release: [ 21, 24 ]
     steps:
       - uses: actions/checkout@v3
       - name: Set up JDK ${{ matrix.java-release }}