chore: add jdk 8 verification to showcase CI

Author: mpeddada1

.github/workflows/ci.yaml

@@ -217,7 +217,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        java: [ 11, 17, 21, 23 ]
+        java: [ 8, 11, 17, 21, 23 ]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-java@v4