Bump mockdate from 2.0.5 to 3.0.3

Bumps [mockdate](https://github.com/boblauer/MockDate) from 2.0.5 to 3.0.3.
- [Release notes](https://github.com/boblauer/MockDate/releases)
- [Changelog](https://github.com/boblauer/MockDate/blob/master/CHANGELOG.md)
- [Commits](boblauer/MockDate@v2.0.5...v3.0.3)

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

Author: dependabot-preview[bot]

package.json

@@ -73,7 +73,7 @@
     "enzyme-adapter-react-16": "^1.1.1",
     "enzyme-to-json": "^3.3.1",
     "jest": "^22.1.4",
-    "mockdate": "^2.0.1",
+    "mockdate": "^3.0.3",
     "pre-commit": "1.x",
     "rc-dialog": "^7.0.0",
     "rc-select": "^9.1.5",