Use Ruby 3.3 for Pro workflows to match Pro package Gemfile

The Pro package Gemfile specifies Ruby 3.3.7, so all Pro CI workflows
should use Ruby 3.3 to match.

Changes:
- pro-lint.yml: Ruby 3 → 3.3
- pro-package-tests.yml: Matrix ['3.2', '3.4'] → ['3.3'] (single version)
- pro-integration-tests.yml: Ruby 3.4 → 3.3 (all jobs)

This fixes the CI error:
'Your Ruby version is 3.4.7, but your Gemfile specified 3.3.7'

Author: AbanoubGhadban

.github/workflows/pro-integration-tests.yml

@@ -22,7 +22,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.4
+          ruby-version: 3.3
           bundler: 2.5.4
 
       - name: Setup Node
@@ -109,7 +109,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.4
+          ruby-version: 3.3
           bundler: 2.5.4
 
       - name: Setup Node
@@ -279,7 +279,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.4
+          ruby-version: 3.3
           bundler: 2.5.4
 
       - name: Setup Node

.github/workflows/pro-lint.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3
+          ruby-version: 3.3
           bundler: 2.5.4
 
       - name: Setup Node

.github/workflows/pro-package-tests.yml

@@ -65,7 +65,7 @@ jobs:
   rspec-package-specs:
     strategy:
       matrix:
-        ruby-version: ['3.2', '3.4']
+        ruby-version: ['3.3']
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4