npm: bump ts-jest from 26.5.1 to 26.5.4

Bumps [ts-jest](https://github.com/kulshekhar/ts-jest) from 26.5.1 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@v26.5.1...v26.5.4)

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

Author: dependabot[bot]

package-lock.json

@@ -97,7 +97,7 @@
         "remark-preset-davidtheclark": "^0.12.0",
         "remark-validate-links": "^10.0.2",
         "semantic-release": ">=17.2.3",
-        "ts-jest": "^26.5.1",
+        "ts-jest": "^26.5.4",
         "ts-node": ">=9.0.0",
         "husky": "^5.0.8",
         "typedoc": "^0.20.28",