Stop testing on Ruby 2

These rubies are all past EOL

.github/workflows/ruby.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [jruby-9.3.3.0, 2.7, '3.0', '3.1']
+        ruby: [jruby-9.3.3.0, '3.0', '3.1']
         faraday: ['~> 0.17', '~> 1', '~>2']
     steps:
     - uses: actions/checkout@v2
@@ -27,11 +27,6 @@ jobs:
       run: bundle exec rake
       env:
         FARADAY_VERSION: ${{ matrix.faraday}}
-  legacy_tests:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        ruby: [jruby-9.2.20.0, 2.4, 2.5, 2.6, 2.7]
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby