RATIS-2359. Use JDK 17 for CI checks (#1315)

Author: adoroszlai

.github/workflows/check.yaml

@@ -30,8 +30,8 @@ on:
       # OPTIONAL (ordered alphabetically)
       java-version:
         type: string
-        description: "Java version to set up (default: 8)"
-        default: '8'
+        description: "Java version to set up (default: 17)"
+        default: '17'
         required: false
 
       needs-binary-tarball:

.github/workflows/ci.yaml

@@ -38,7 +38,7 @@ jobs:
       - build
     strategy:
       matrix:
-        java: [ 11, 17, 21 ]
+        java: [ 8, 11, 17, 21 ]
       fail-fast: false
     uses: ./.github/workflows/check.yaml
     with: