chore(deps): update dependency jest to v26

Author: renovate-bot

Diff for: package.json

@@ -20,7 +20,7 @@
     "@types/fetch-mock": "7.3.3",
     "@types/jest": "24.9.1",
     "fetch-mock": "7.7.3",
-    "jest": "24.9.0",
+    "jest": "26.6.0",
     "rimraf": "2.7.1",
     "semantic-release": "15.14.0",
     "ts-jest": "24.3.0",