chore(deps): update dependency ts-jest to v26.4.0

Author: renovate-bot

package-lock.json

@@ -40,7 +40,7 @@
     "reflect-metadata": "0.1.13",
     "release-it": "14.0.3",
     "rimraf": "3.0.2",
-    "ts-jest": "26.3.0",
+    "ts-jest": "26.4.0",
     "typescript": "4.0.2"
   },
   "lint-staged": {