Change ruby version for CI issue

Author: bishosilwal

.github/workflows/gempush.yml

@@ -13,7 +13,7 @@ jobs:
     - name: Set up Ruby 2.6
       uses: actions/setup-ruby@v1
       with:
-        version: 2.6
+        version: 2.6.5
 
     - name: Run Test Cases
       run: |

.github/workflows/test.yml

@@ -12,7 +12,7 @@ jobs:
       - name: Set up Ruby 2.6
         uses: actions/setup-ruby@v1
         with:
-          ruby-version: 2.6
+          ruby-version: 2.6.5
       - name: Build and test with Rake
         run: |
           gem install bundler