Remove jruby from CI matrix

It somehow get stuck and doesn't give any output.
I'm tired of this shit.

Author: byroot

.github/workflows/test.yaml

@@ -33,7 +33,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ["3.1", "3.0", "2.7", "2.6", "2.5", "2.4", "jruby-9.2.9.0"]
+        ruby: ["3.1", "3.0", "2.7", "2.6", "2.5", "2.4"]
     runs-on: ubuntu-latest
     env:
       VERBOSE: "true"