Fix danger.yml workflow

Resolves the following error:
Invalid workflow file: .github/workflows/danger.yml#L1
(Line: 20, Col: 12): Unexpected value ''

Commit 8b95198 should've removed this alongside the `ruby-version: ` code.

Author: aaronskiba

.github/workflows/danger.yml

@@ -17,7 +17,6 @@ jobs:
     # Install Ruby - using the version found in the Gemfile.lock
     - name: 'Install Ruby'
       uses: ruby/setup-ruby@v1
-      with:
 
     - name: 'Bundle Install'
       run: |