Update build workflow to use latest upload artifacts action

Author: Pyrofab

.github/workflows/build.yml

@@ -36,7 +36,7 @@ jobs:
         run: ./gradlew build
       - name: capture build artifacts
         if: ${{ runner.os == 'Linux' && matrix.java == '21' }} # Only upload artifacts built from latest java on one OS
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: Artifacts
           path: build/libs/