Drop jruby-9.3.14.0 testing

jruby-9.3 was used in openvox server 7. We don't support that anymore.

Author: bastelfreak

.github/workflows/ci.yaml

@@ -141,7 +141,6 @@ jobs:
         cfg:
           - {os: ubuntu-latest, ruby: '2.7'}
           - {os: ubuntu-22.04, ruby: '3.2'} # with openssl 3
-          - {os: ubuntu-22.04, ruby: 'jruby-9.3.14.0'}
           - {os: ubuntu-latest, ruby: 'jruby-9.4.8.0'}
           - {os: ubuntu-latest, ruby: 'jruby-9.4.12.1'}
           - {os: windows-2022, ruby: '2.7'}