chore: remove support ruby<3.0

Author: itsmeadi

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
             fetch-depth: 0 # gives the commit linter access to previous commits
 
       - name: Commit message linter
-        if: ${{ matrix.ruby == '2.5' }}
+        if: ${{ matrix.ruby == '3.0' }}
         uses: wagoid/commitlint-github-action@v4
 
       - uses: ruby/setup-ruby@v1

.rubocop.yml

@@ -1,7 +1,7 @@
 AllCops:
   DisabledByDefault: false
   NewCops: enable
-  TargetRubyVersion: 2.5
+  TargetRubyVersion: 3.0
 
 Layout/LineLength:
   Enabled: false