Update dependency graphiql to v1.5.15 (#151)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

package-lock.json

@@ -19,7 +19,7 @@
         "@adobe/exc-app": "0.2.47",
         "core-js": "3.19.3",
         "dataloader": "1.4.0",
-        "graphiql": "1.5.13",
+        "graphiql": "1.5.15",
         "graphql": "14.7.0",
         "graphql-tools": "3.1.1",
         "prop-types": "15.7.2",