ci: update GitHub workflows config

Author: Mattia Roccoberton

.github/workflows/linters.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '2.7'
+          ruby-version: '3.0'
           bundler-cache: true
 
       - name: Set up Reviewdog

.github/workflows/specs_mysql_61.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['2.7', '3.0']
+        ruby: ['3.0', '3.1', '3.2']
         gemfile: ['rails_6_1_mysql']
 
     env:

.github/workflows/specs_mysql_70.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['3.0', '3.2']
+        ruby: ['3.0', '3.1', '3.2']
         gemfile: ['rails_7_0_mysql']
 
     env:

.github/workflows/specs_postgres_61.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['2.7', '3.0']
+        ruby: ['3.0', '3.1', '3.2']
         gemfile: ['rails_6_1_postgres']
 
     env:

.github/workflows/specs_postgres_70.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['3.0', '3.2']
+        ruby: ['3.0', '3.1', '3.2']
         gemfile: ['rails_7_0_postgres']
 
     env: