Update dependency jest to v26

Author: renovate-bot

package.json

@@ -100,7 +100,7 @@
     "eslint-config-prettier": "6.5.0",
     "eslint-plugin-react": "7.22.0",
     "husky": "3.0.9",
-    "jest": "24.9.0",
+    "jest": "26.6.3",
     "lint-staged": "8.2.1",
     "markdownlint-cli": "0.26.0",
     "opn": "5.5.0",