fix(deps): update dependency graphql-sse to v2.6.0 (#146)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

frontend/package-lock.json

@@ -39,7 +39,7 @@
     "deepmerge": "4.3.1",
     "fundamental-styles": "0.37.0",
     "graphql": "16.12.0",
-    "graphql-sse": "2.5.4",
+    "graphql-sse": "2.6.0",
     "minifaker": "1.34.1",
     "rxjs": "~7.8.0",
     "tslib": "2.8.1",