Remove deprecated ruby version from CI build (#191)

Author: marcosdemelo

.github/workflows/config.yml

@@ -7,7 +7,7 @@ jobs:
     strategy:
       fail-fast: false # I understand this is to run on all versions.
       matrix:
-        ruby: ['2', '3.0.4']
+        ruby: ['3.0.4']
 
     runs-on: ubuntu-latest
 
@@ -25,7 +25,7 @@ jobs:
     strategy:
       fail-fast: false # I understand this is to run on all versions.
       matrix:
-        ruby: ['2', '3.0.4']
+        ruby: ['3.0.4']
 
     runs-on: ubuntu-latest