narrow test matrix JDK distributions

Author: puredanger

.github/workflows/test.yml

@@ -8,7 +8,7 @@ jobs:
       matrix:
         os: [ubuntu-latest] # macOS-latest, windows-latest]
         java-version: ["8", "11", "17"]
-        distribution: ["temurin", "oracle", "corretto"]
+        distribution: ["temurin", "corretto"]
         profile: ["test-direct", "test-no-direct"]
     runs-on: ${{ matrix.os }}
     steps: