chore: update dependency jest to v26

Author: renovate-bot

package.json

@@ -60,7 +60,7 @@
     "cpx": "1.5.0",
     "dts-bundle": "0.7.3",
     "gh-pages": "2.0.1",
-    "jest": "24.3.1",
+    "jest": "26.6.3",
     "npm-run-all": "4.1.5",
     "prettier": "1.16.4",
     "rollup": "1.4.1",