update github unit tests action

Author: vananiev

.github/workflows/unit-tests.yml

@@ -17,12 +17,12 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up JDK
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
-          java-version: '18'
+          java-version: '21'
           distribution: 'liberica'
           cache: maven