Update dependency ts-jest to v26.5.6

Author: renovate-bot

package-lock.json

@@ -7,7 +7,7 @@
     "chromedriver": "90.0.0",
     "jest": "26.6.3",
     "selenium-webdriver": "4.0.0-beta.3",
-    "ts-jest": "26.5.5",
+    "ts-jest": "26.5.6",
     "typescript": "4.2.4",
     "webdriver-manager": "12.1.8"
   },