Update dependency jest to v26

Author: renovate-bot

package.json

@@ -23,7 +23,7 @@
     "@types/jest": "22.1.0",
     "@types/node": "8.9.4",
     "@types/minimist": "1.2.0",
-    "jest": "22.1.4",
+    "jest": "26.6.1",
     "bot-tester": "3.4.2",
     "ts-jest": "22.0.2",
     "ts-node": "4.1.0",