Adjust image name

Author: laurynas

.github/workflows/main.yml

@@ -14,7 +14,7 @@ jobs:
           - jruby-head
         arch:
           - ubuntu-latest
-          - ubuntu-latest-arm64
+          - ubuntu-latest-arm
     name: Ruby ${{ matrix.ruby-version }} on ${{ matrix.arch }}
     steps:
       - uses: actions/checkout@v3