Update CI templates

* Next version of Bundler will auto choose jobs by default
* --retry 3 is already default

lib/bundler/templates/newgem/.github/workflows/main.yml.tt

@@ -7,12 +7,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Ruby <%= ::Gem::Version.new(RUBY_VERSION).segments[0..1].join(".") %>
+    - name: Set up Ruby
       uses: actions/setup-ruby@v1
       with:
         ruby-version: <%= ::Gem::Version.new(RUBY_VERSION).segments[0..1].join(".") %>.x
     - name: Build and test with Rake
       run: |
         gem install bundler -v <%= Bundler::VERSION %>
-        bundle install --jobs 4 --retry 3
+        bundle install
         bundle exec rake

lib/bundler/templates/newgem/.gitlab-ci.yml.tt

@@ -4,6 +4,6 @@ before_script:
   - gem install bundler -v <%= Bundler::VERSION %>
   - bundle install
 
-example_job:
+test:
   script:
-    - bundle exec rake
+    - bundle exec rake test