deps: bump ts-jest from 26.3.0 to 26.4.0 (#492)

Bumps [ts-jest](https://github.com/kulshekhar/ts-jest) from 26.3.0 to 26.4.0.
- [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/v26.3.0...v26.4.0)

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

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

package.json

@@ -78,7 +78,7 @@
     "lint-staged": "^10.4.0",
     "prettier": "2.1.2",
     "standard-version": "^9.0.0",
-    "ts-jest": "^26.3.0",
+    "ts-jest": "^26.4.0",
     "typescript": "^4.0.2"
   }
 }