Update plugin upload path in workflow

Changed the path used to upload the HIColorer plugin in the GitHub Actions workflow. It now correctly points to the plugin-upload directory instead of the plugin-update directory.

Author: ivandrofly

.github/workflows/main.yml

@@ -53,6 +53,6 @@ jobs:
           file-name: HI2UC
 
       - name: Upload HIColorer
-        uses: ./.github/plugin-update
+        uses: ./.github/workflows/plugin-upload
         with:
           file-name: HIColorer