build(deps-dev): bump ts-jest from 26.5.3 to 26.5.6 (#446)

Bumps [ts-jest](https://github.com/kulshekhar/ts-jest) from 26.5.3 to 26.5.6.
- [Release notes](https://github.com/kulshekhar/ts-jest/releases)
- [Changelog](https://github.com/kulshekhar/ts-jest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/kulshekhar/ts-jest/compare/v26.5.3...v26.5.6)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -57,7 +57,7 @@
     "prettier": "^2.2.1",
     "standard-version": "^9.2.0",
     "terminal-link": "^2.1.1",
-    "ts-jest": "^26.5.3",
+    "ts-jest": "^26.5.6",
     "typescript": "^4.2.4"
   }
 }