Resolve Nds4j from Maven Central instead of building it in CI

.github/workflows/build.yml

@@ -25,32 +25,6 @@ jobs:
           java-version: '21'
           cache: maven
 
-      # Nds4j is not on Maven Central at the version this module depends on, so it has to be
-      # built from source. Prefer a branch of the same name when one exists: a change that
-      # spans both repositories is developed on matching branches, and testing this module
-      # against a stale Nds4j would report a failure that does not exist (or hide a real one).
-      - name: Resolve Nds4j branch
-        id: nds4j
-        run: |
-          ref="${{ github.head_ref || github.ref_name }}"
-          if git ls-remote --exit-code --heads https://github.com/turtleisaac/Nds4j.git "$ref" >/dev/null 2>&1; then
-            echo "Building against matching Nds4j branch: $ref"
-          else
-            echo "No Nds4j branch named '$ref'; falling back to main"
-            ref=main
-          fi
-          echo "ref=$ref" >> "$GITHUB_OUTPUT"
-
-      - name: Check out Nds4j
-        uses: actions/checkout@v4
-        with:
-          repository: turtleisaac/Nds4j
-          ref: ${{ steps.nds4j.outputs.ref }}
-          path: .upstream/Nds4j
-
-      - name: Install Nds4j
-        run: mvn -B -ntp -q install -DskipTests -f .upstream/Nds4j/pom.xml
-
       - name: Build and test
         # Round-trip tests against real game data need a retail ROM, which cannot be committed.
         # They skip here and are run locally with -Drom.dir. Everything else runs.