Bump ts-jest from 26.4.4 to 26.5.4

Bumps [ts-jest](https://github.com/kulshekhar/ts-jest) from 26.4.4 to 26.5.4.
- [Release notes](https://github.com/kulshekhar/ts-jest/releases)
- [Changelog](https://github.com/kulshekhar/ts-jest/blob/master/CHANGELOG.md)
- [Commits](kulshekhar/ts-jest@v26.4.4...v26.5.4)

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -39,7 +39,7 @@
     "jest-circus": "^26.6.3",
     "js-yaml": "^3.14.0",
     "prettier": "2.2.1",
-    "ts-jest": "^26.4.4",
+    "ts-jest": "^26.5.4",
     "typescript": "^4.1.3"
   }
 }