Update action.yml to use artifacts@v4

v3 is getting deprecated.

Author: aeisenberg

go/actions/test/action.yml

@@ -59,7 +59,7 @@ runs:
 
     - name: Upload qhelp markdown
       if: inputs.run-code-checks == 'true' && !cancelled()
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: qhelp-markdown
         path: go/qhelp-out/**/*.md