chore(deps-dev): bump ts-jest from 26.5.4 to 26.5.6

Bumps [ts-jest](https://github.com/kulshekhar/ts-jest) from 26.5.4 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](kulshekhar/ts-jest@v26.5.4...v26.5.6)

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

package.json

@@ -41,7 +41,7 @@
     "stylelint": "^13.8.0",
     "stylelint-config-prettier": "^8.0.2",
     "stylelint-config-standard": "^21.0.0",
-    "ts-jest": "^26.5.4",
+    "ts-jest": "^26.5.6",
     "ts-loader": "^8.1.0",
     "ts-node": "^9.1.1",
     "tsconfig-paths": "^3.9.0",