build: oops, yaml syntax

Author: nedbat

.github/workflows/kit.yml

@@ -308,5 +308,5 @@ jobs:
         uses: actions/upload-artifact@834a144ee995460fba8ed112a2fc961b36a5ec5a # v4.3.6
         with:
           name: signatures
-          path: *.sigstore.json
+          path: "*.sigstore.json"
           retention-days: 7