Update dependency jest to v26.6.0

Author: renovate-bot

package.json

@@ -35,7 +35,7 @@
   },
   "devDependencies": {
     "@types/jest": "26.0.14",
-    "jest": "26.5.3",
+    "jest": "26.6.0",
     "jest-fetch-mock": "3.0.3",
     "ts-jest": "26.4.1",
     "tslint": "6.1.3",