ci(test): drop testing of ruby 2.2

Author: YOU54F

.github/workflows/test.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby_version: ["2.2", "2.7", "3.0", "3.2"]
+        ruby_version: ["2.7", "3.0", "3.2"]
         os: ["ubuntu-latest","windows-latest","macos-latest"]
     steps:
       - uses: actions/checkout@v2