Bump mockdate from 3.0.2 to 3.0.3

Bumps [mockdate](https://github.com/boblauer/MockDate) from 3.0.2 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@v3.0.2...v3.0.3)

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

package.json

@@ -139,7 +139,7 @@
     "happo.io": "^6.4.0",
     "markdown-spellcheck": "^1.3.1",
     "mime-types": "^2.1.29",
-    "mockdate": "^3.0.2",
+    "mockdate": "^3.0.3",
     "prettier": "2.2.1",
     "react-test-renderer": "^17.0.1",
     "source-map-explorer": "^2.5.2",

yarn.lock

@@ -13237,10 +13237,10 @@ mkdirp@^1.0.3, mkdirp@^1.0.4:
   resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-1.0.4.tgz#3eb5ed62622756d79a5f0e2a221dfebad75c2f7e"
   integrity sha512-vVqVZQyf3WLx2Shd0qJ9xuvqgAyKPLAiqITEtqW0oIUjzo3PePDd6fW9iFz30ef7Ysp/oiWqbhszeGWW2T6Gzw==
 
-mockdate@^3.0.2:
-  version "3.0.2"
-  resolved "https://registry.yarnpkg.com/mockdate/-/mockdate-3.0.2.tgz#a5a7bb5820da617747af424d7a4dcb22c6c03d79"
-  integrity sha512-ldfYSUW1ocqSHGTK6rrODUiqAFPGAg0xaHqYJ5tvj1hQyFsjuHpuWgWFTZWwDVlzougN/s2/mhDr8r5nY5xDpA==
+mockdate@^3.0.3:
+  version "3.0.3"
+  resolved "https://registry.yarnpkg.com/mockdate/-/mockdate-3.0.3.tgz#944e655bde9d1d35046601adb00aeb09c98a5ee7"
+  integrity sha512-4h01Zjz0Cm57mQsEzaoZtjGzqZk15YS4yujc5k4xGGNQYaxlaJSaNZ20FkFhFWjv6YB7ZyU8+UioB8l6Fw892Q==
 
 moment@^2.29.1:
   version "2.29.1"