Make sure this runs on last 9.4 JRuby

Author: enebo

.github/workflows/ruby.yml

@@ -243,7 +243,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ['jruby-9.3.7.0']
+        ruby-version: ['jruby-9.4.6.0']
         db: ['sqlite3']
         test_targets: ['test_sqlite3']