Remove oracle testing for now

Author: vietj

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

@@ -52,9 +52,6 @@ jobs:
           - os: ubuntu-latest
             jdk: 17
             profile: 'MSSQL-2019-latest'
-          - os: ubuntu-latest
-            jdk: 17
-            profile: 'Oracle-21'
     uses: ./.github/workflows/ci.yml
     with:
       branch: 4.x