build(deps): update dependency ts-jest to v26

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

package-lock.json

@@ -43,7 +43,7 @@
     "prettier": "^2.0.1",
     "semantic-release": "^17.0.0",
     "semantic-release-plugin-update-version-in-files": "^1.0.0",
-    "ts-jest": "^25.1.0",
+    "ts-jest": "^26.0.0",
     "typescript": "^3.6.4"
   },
   "jest": {