Bump ts-jest from 25.1.0 to 25.2.1 (#16)

Bumps [ts-jest](https://github.com/kulshekhar/ts-jest) from 25.1.0 to 25.2.1.
- [Release notes](https://github.com/kulshekhar/ts-jest/releases)
- [Changelog](https://github.com/kulshekhar/ts-jest/blob/master/CHANGELOG.md)
- [Commits](kulshekhar/ts-jest@v25.1.0...25.2.1)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -12,7 +12,7 @@
   "devDependencies": {
     "@types/jest": "^25.1.1",
     "jest": "^25.1.0",
-    "ts-jest": "^25.1.0",
+    "ts-jest": "^25.2.1",
     "ts-loader": "^6.2.1",
     "typescript": "^3.7.5",
     "webpack": "^4.41.5",