Disable CI against JRuby builds

Rails 7.0 requires Ruby 2.7 or higeher.
CI pending the following matrix until JRuby 9.4 that supports Ruby 2.7 will be released.
jruby/jruby#6464

.github/workflows/test.yml

@@ -11,11 +11,14 @@ jobs:
     continue-on-error: true
     strategy:
       matrix:
+        # Rails 7.0 requires Ruby 2.7 or higeher.
+        # CI pending the following matrix until JRuby 9.4 that supports Ruby 2.7 will be released.
+        # https://github.com/jruby/jruby/issues/6464
+        # - jruby,
+        # - jruby-head
         ruby: [
           '3.0',
-          '2.7',
-          jruby,
-          jruby-head
+          '2.7'
         ]
     env:
       ORACLE_HOME: /usr/lib/oracle/18.5/client64

.travis.yml

@@ -40,14 +40,17 @@ language: ruby
 rvm:
   - 3.0.0
   - 2.7.2
-  - jruby-9.2.14.0
   - ruby-head
-  - jruby-head
+  # Rails 7.0 requires Ruby 2.7 or higeher.
+  # CI pending until JRuby 9.4 that supports Ruby 2.7 will be released.
+  # https://github.com/jruby/jruby/issues/6464
+  # - jruby-9.4.0
+  # - jruby-head
 
-matrix:
-  allow_failures:
-  - rvm: jruby-9.2.14.0
-  - rvm: jruby-head
+# matrix:
+#   allow_failures:
+#   - rvm: jruby-9.4.0
+#   - rvm: jruby-head
 
 notifications:
     email: false