Toolchain should target 17 instead of 11 now

Author: vietj

.github/workflows/ci-4.x.yml

@@ -37,9 +37,6 @@ jobs:
           - os: ubuntu-latest
             jdk: 8
             profile: 'DB2-11.5'
-          - os: ubuntu-latest
-            jdk: 8
-            profile: 'Oracle-21'
           - os: ubuntu-latest
             jdk: 8
             profile: 'SQL-templates'