DEV: Remove non-existent option from setup-ruby Github action

DEV: Remove non-existent option from setup-ruby Github action

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7e7ce7f..03f4e10 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -77,7 +77,6 @@ jobs:
         uses: actions/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
-          architecture: "x64"
 
       - name: Setup bundler
         run: |

GitHub sha: 6b7a2d6d