Update actions/upload-artifact to v4.

Avoids github deprecation notice.

Author: thejpster

.github/workflows/rust.yml

@@ -37,7 +37,7 @@ jobs:
           ./build.sh --verbose
 
       - name: Upload Artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: ${{success()}}
         with:
           name: Artifacts