Add latest rubies to CI matrix

- Add Ruby 3.2, 3.3, 3.4 and JRuby 9.4, 10.0.
- Remove JRuby 9.2 since setup-ruby on Ubuntu 24.4 only provides builds for JRuby 9.4 and later.
- Update actions/checkout to the latest

Author: willnet

.github/workflows/test-and-deploy.yml

@@ -20,7 +20,7 @@ jobs:
         ruby: [ '2.4', '2.5', '2.6', '2.7', '3.0', '3.1', '3.2', '3.3', '3.4', 'jruby-9.4', 'jruby-10.0' ]
     steps:
       - name: Checkout ruby-http-client
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
@@ -54,7 +54,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout ruby-http-client
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0