chore(deps): update dependency ts-jest to v26.4.1

Author: renovate-bot

package-lock.json

@@ -45,7 +45,7 @@
     "rxjs": "6.6.3",
     "rxjs-compat": "6.6.3",
     "supertest": "5.0.0",
-    "ts-jest": "26.4.0",
+    "ts-jest": "26.4.1",
     "typeorm": "0.2.26",
     "typescript": "4.0.3"
   },