fix: let ruby/setup-ruby handle bundler installation to fix OpenSSL issue

- Changed bundler from 'none' to '4.0.0' in Setup Ruby step
- Removed separate Install Bundler step that was failing on macOS
- ruby/setup-ruby knows how to install bundler with proper OpenSSL support
- Fixes: ERROR: OpenSSL is not available on macOS runners

Author: Goldziher

.github/workflows/ci-ruby.yaml

@@ -145,14 +145,10 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: "3.2"
-          bundler: none
+          bundler: "4.0.0"
           bundler-cache: false
           working-directory: packages/ruby
 
-      - name: Install Bundler
-        shell: bash
-        run: scripts/ci/ruby/install-bundler.sh
-
       - name: Set BUNDLE_GEMFILE (Unix)
         if: runner.os != 'Windows'
         shell: bash
@@ -549,14 +545,10 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: "3.2"
-          bundler: none
+          bundler: "4.0.0"
           bundler-cache: false
           working-directory: packages/ruby
 
-      - name: Install Bundler
-        shell: bash
-        run: scripts/ci/ruby/install-bundler.sh
-
       - name: Set BUNDLE_GEMFILE (Unix)
         if: runner.os != 'Windows'
         shell: bash