ci: bump actions/upload-artifact v3 -> v4

v3 of the artifact actions is deprecated and now hard-fails on GitHub-hosted
runners. Bumps to v4 so the Build workflow runs.

Author: twigglits

.github/workflows/build.yml

@@ -21,7 +21,7 @@ jobs:
           npm run build
 
       - name: Archive built file
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: lg-remote-control
           path: dist/lg-remote-control.js