Bump ts-jest from 26.5.5 to 26.5.6

Bumps [ts-jest](https://github.com/kulshekhar/ts-jest) from 26.5.5 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/v26.5.5...v26.5.6)

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

package.json

@@ -32,7 +32,7 @@
     "jest": "^26.6.3",
     "jest-junit": "^12.0.0",
     "request": "^2.88.2",
-    "ts-jest": "^26.5.5",
+    "ts-jest": "^26.5.6",
     "typescript": "^4.2.4",
     "yarn": "^1.22.10"
   },