Update cross-gem action to oxidize-rb/actions

We had been using the deprecated `oxidize-rb/cross-gem-action` action so
far as the new one somehow didn't work. But it seems to be working now
and the old one is broken now. So let's switch to the new one.

Author: kateinoigakukun

.github/workflows/build-gems.yml

@@ -33,20 +33,18 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: oxidize-rb/actions/setup-ruby-and-rust@v1
+      - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "3.3"
-          bundler-cache: true
-          cargo-cache: true
-          cargo-vendor: true
-          cache-version: v2-${{ matrix.ruby-platform }}
+          ruby-version: "3.4"
 
-      - name: Set vars
-        id: vars
-        run: |
-          echo "rb-sys-version=$(bundle exec ruby -rrb_sys -e 'puts RbSys::VERSION')" >> $GITHUB_OUTPUT
-      - uses: oxidize-rb/cross-gem-action@main
+      - uses: oxidize-rb/actions/cross-gem@v1
+        id: cross-gem
         with:
-          version: ${{ steps.vars.outputs.rb-sys-version }}
           platform: ${{ matrix.ruby-platform }}
-          ruby-versions: ${{ join(fromJSON(needs.ci-data.outputs.result).stable-ruby-versions, ', ') }}
+          ruby-versions: ${{ join(fromJSON(needs.ci-data.outputs.result).stable-ruby-versions, ',') }}
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: cross-gem-${{ matrix.ruby-platform }}
+          path: ${{ steps.cross-gem.outputs.gem-path }}
+          if-no-files-found: error