Use oxidize-rb/actions/cross-gem@v1 instead of oxidize-rb/cross-gem-a…

…ction@main

https://github.com/oxidize-rb/cross-gem-action has been
archived in favor of https://github.com/oxidize-rb/cross-gem-action.

.github/workflows/gem.yml

@@ -39,25 +39,20 @@ jobs:
         id: transform_platform
         run: echo "cross_gem_platform=$(echo '${{ matrix.platform }}' | sed 's/-gnu$//')" >> $GITHUB_ENV
 
-      - uses: oxidize-rb/cross-gem-action@main
+      - uses: oxidize-rb/actions/cross-gem@v1
+        id: cross-gem
         with:
           platform: ${{ env.cross_gem_action_platform }}
           version: 'latest'
-          env: |
-            RUBY_CC_VERSION=3.4.0:3.3.5:3.2.0:3.1.0
-
-      - uses: actions/download-artifact@v3
-        with:
-          name: cross-gem
-          path: pkg/
+          ruby-versions: '3.1,3.2,3.3,3.4'
 
       - name: Display structure of built gems
         run: ls -R
-        working-directory: pkg/
+        working-directory: ${{ steps.cross-gem.outputs.gem-path }}
 
       - name: Release gem
         if: startsWith(github.ref, 'refs/tags/v')
-        working-directory: pkg/
+        working-directory: ${{ steps.cross-gem.outputs.gem-path }}
         env:
           RUBYGEMS_API_KEY: ${{secrets.RUBYGEMS_API_KEY}}
         run: |