Update gempush action to remove GPR publish

We don't need to publish to GPR right now.

.github/workflows/gempush.yml

@@ -17,18 +17,6 @@ jobs:
       with:
         version: 2.6.x
 
-    - name: Publish to GPR
-      run: |
-        mkdir -p $HOME/.gem
-        touch $HOME/.gem/credentials
-        chmod 0600 $HOME/.gem/credentials
-        printf -- "---\n:github: Bearer ${GEM_HOST_API_KEY}\n" > $HOME/.gem/credentials
-        gem build *.gemspec
-        gem push --KEY github --host https://rubygems.pkg.github.com/${OWNER} *.gem
-      env:
-        GEM_HOST_API_KEY: ${{secrets.GPR_AUTH_TOKEN}}
-        OWNER: username
-
     - name: Publish to RubyGems
       run: |
         mkdir -p $HOME/.gem