Remove ruby 2.7

Author: arutkowski00

.github/workflows/ci.yml

@@ -55,7 +55,7 @@ jobs:
       fail-fast: false
       matrix:
         appraisal: [ 'graphql-1.10', 'graphql-1.11', 'graphql-1.12', 'graphql-1.13', 'graphql-2.0' ]
-        ruby: [ '2.7', '3.0', '3.1', '3.2' ]
+        ruby: [ '3.0', '3.1', '3.2' ]
         exclude:
           - appraisal: 'graphql-1.10'
             ruby: '3.2'