chore(package): update ts-jest to version 26.0.0

Author: greenkeeper[bot]

package.json

@@ -47,7 +47,7 @@
     "rollup-plugin-json": "^4.0.0",
     "semantic-release": "^17.0.0",
     "serve-handler": "^6.1.1",
-    "ts-jest": "^25.1.0",
+    "ts-jest": "^26.0.0",
     "typescript": "^3.6.2"
   },
   "jest": {