remove ruby 2.7.5 from CI suite

.github/workflows/acceptance.yml

@@ -57,7 +57,7 @@ jobs:
     name: runner / acceptance-tests
     strategy:
       matrix:
-        ruby: [ '2.7.5', '3.1.2', '3.2.2', '3.3.0', '3.3.1' ]
+        ruby: [ '3.1.2', '3.2.2', '3.3.0', '3.3.1' ]
 
     steps:
       - uses: ruby/setup-ruby@1198b074305f9356bd56dd4b311757cc0dab2f1c # pin@v1.175.1

.github/workflows/lint.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [ '2.7.5', '3.1.2', '3.2.2', '3.3.0', '3.3.1' ]
+        ruby: [ '3.1.2', '3.2.2', '3.3.0', '3.3.1' ]
 
     steps:
       - name: checkout

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [ '2.7.5', '3.1.2', '3.2.2', '3.3.0', '3.3.1' ]
+        ruby: [ '3.1.2', '3.2.2', '3.3.0', '3.3.1' ]
 
     steps:
       - name: checkout