Update github upload-artifact actions to v4 (#84)

Author: rnakade

.github/workflows/build.yml

@@ -35,7 +35,7 @@ jobs:
         run: ./gradlew check :ftlModelBuilder:check publish --stacktrace --no-configuration-cache
       - name: "Upload build repository"
         continue-on-error: true
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: repo
           path: AndroidXCI/build/repo