deps: bump ts-jest from 25.3.1 to 25.4.0

Bumps [ts-jest](https://github.com/kulshekhar/ts-jest) from 25.3.1 to 25.4.0.
- [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/v25.3.1...v25.4.0)

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

package.json

@@ -73,7 +73,7 @@
     "nock": "^12.0.3",
     "prettier": "2.0.4",
     "standard-version": "^7.1.0",
-    "ts-jest": "^25.3.1",
+    "ts-jest": "^25.4.0",
     "typescript": "^3.8.3"
   }
 }