Remove testing from 2.7 in CI to make life easier for gemspec resolution and CI confdig

Author: luke-hill

.github/workflows/test-ruby.yml

@@ -17,7 +17,7 @@ jobs:
       matrix:
         os:
           - ubuntu-latest
-        ruby: ['2.7', '3.0', '3.1', '3.2', '3.3', '3.4', '3.5']
+        ruby: ['3.0', '3.1', '3.2', '3.3', '3.4', '3.5']
         include:
           - os: windows-latest
             ruby: '3.4'