chore(deps): update dependency @types/jest to v26.0.21

Author: renovate-bot

package-lock.json

@@ -33,7 +33,7 @@
   },
   "homepage": "https://github.com/DanielMSchmidt/reactive-graphql-react#readme",
   "devDependencies": {
-    "@types/jest": "26.0.20",
+    "@types/jest": "26.0.21",
     "graphql-tag": "2.11.0",
     "graphql-tools": "5.0.0",
     "jest": "26.6.3",