Update CI config: fix incompatibility with latest Mocha gem version

Author: nanego

.github/workflows/4_2_11.yml

@@ -89,6 +89,8 @@ jobs:
       - name: Prepare Redmine source
         working-directory: redmine
         run: |
+          # TODO Remove the following line when https://www.redmine.org/issues/40551 is fixed
+          sed -i -e 's/.*mocha.*/  gem "mocha", "2.1.0"/' Gemfile # Fix core tests not compatible with Mocha 2.2.0
           sed -i '/rubocop/d' Gemfile
           rm -f .rubocop*
           cp plugins/redmine_base_rspec/spec/support/database-${{ matrix.db }}.yml config/database.yml

.github/workflows/master.yml

@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['2.7']
+        ruby: ['3.2']
         db: ['postgres']
       fail-fast: false