Update dependency ts-jest to v26

Author: renovate-bot

package.json

@@ -25,7 +25,7 @@
     "eslint-plugin-prettier": "3.1.1",
     "pre-commit": "1.2.2",
     "prettier": "1.18.2",
-    "ts-jest": "24.1.0",
+    "ts-jest": "26.2.0",
     "ts-node": "8.4.1"
   },
   "dependencies": {