fix: upgrade graphql-tag from 2.12.5 to 2.12.6

Snyk has created this PR to upgrade graphql-tag from 2.12.5 to 2.12.6.

See this package in npm:
https://www.npmjs.com/package/graphql-tag

See this project in Snyk:
https://app.snyk.io/org/acinader/project/21343059-02d9-4182-87d7-718a44b181ef?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -36,7 +36,7 @@
     "graphql": "15.7.0",
     "graphql-list-fields": "2.0.2",
     "graphql-relay": "0.7.0",
-    "graphql-tag": "2.12.5",
+    "graphql-tag": "2.12.6",
     "graphql-upload": "11.0.0",
     "intersect": "1.0.1",
     "jsonwebtoken": "8.5.1",