build(deps-dev): 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](kulshekhar/ts-jest@v26.5.5...v26.5.6)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

yarn.lock

@@ -852,7 +852,7 @@
   dependencies:
     "@types/istanbul-lib-report" "*"
 
-"@types/jest@26.x", "@types/jest@^26.0.16":
+"@types/jest@^26.0.16":
   version "26.0.20"
   resolved "https://registry.yarnpkg.com/@types/jest/-/jest-26.0.20.tgz#cd2f2702ecf69e86b586e1f5223a60e454056307"
   integrity sha512-9zi2Y+5USJRxd0FsahERhBwlcvFh6D2GLQnY2FH2BzK8J9s9omvNHIbvABwIluXa0fD8XVKMLTO0aOEuUfACAA==
@@ -7179,11 +7179,10 @@ trim-right@^1.0.1:
   integrity sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=
 
 ts-jest@^26.2.0:
-  version "26.5.2"
-  resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-26.5.2.tgz#5281d6b44c2f94f71205728a389edc3d7995b0c4"
-  integrity sha512-bwyJ2zJieSugf7RB+o8fgkMeoMVMM2KPDE0UklRLuACxjwJsOrZNo6chrcScmK33YavPSwhARffy8dZx5LJdUQ==
+  version "26.5.6"
+  resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-26.5.6.tgz#c32e0746425274e1dfe333f43cd3c800e014ec35"
+  integrity sha512-rua+rCP8DxpA8b4DQD/6X2HQS8Zy/xzViVYfEs2OQu68tkCuKLV0Md8pmX55+W24uRIyAsf/BajRfxOs+R2MKA==
   dependencies:
-    "@types/jest" "26.x"
     bs-logger "0.x"
     buffer-from "1.x"
     fast-json-stable-stringify "2.x"