(maint) update upload-artifact version to v4

v1 and v2 of the upload-artifact are no longer available. This updates
to version 4.

Author: jonathannewman

.github/workflows/component_diff_check.yaml

@@ -35,7 +35,7 @@ jobs:
           cat ./output/text
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: artifacts
           path: output/