chore(deps-dev): bump jest from 24.9.0 to 26.6.1 in /api-server

Bumps [jest](https://github.com/facebook/jest) from 24.9.0 to 26.6.1.
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/facebook/jest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/jest/compare/v24.9.0...v26.6.1)

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

api-server/package.json

@@ -78,7 +78,7 @@
     "babel-plugin-transform-function-bind": "^6.22.0",
     "babel-plugin-transform-imports": "^1.5.1",
     "cross-env": "^6.0.3",
-    "jest": "^24.9.0",
+    "jest": "^26.6.1",
     "joi": "^13.7.0",
     "joi-objectid": "^2.0.0",
     "loopback-component-explorer": "^6.4.0",