Bump date-fns from 2.20.3 to 2.21.1

Bumps [date-fns](https://github.com/date-fns/date-fns) from 2.20.3 to 2.21.1.
- [Release notes](https://github.com/date-fns/date-fns/releases)
- [Changelog](https://github.com/date-fns/date-fns/blob/master/CHANGELOG.md)
- [Commits](https://github.com/date-fns/date-fns/compare/v2.20.3...v2.21.1)

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

package-lock.json

@@ -6192,9 +6192,9 @@
       }
     },
     "date-fns": {
-      "version": "2.20.3",
-      "resolved": "https://registry.npmjs.org/date-fns/-/date-fns-2.20.3.tgz",
-      "integrity": "sha512-BbiJSlfmr1Fnfi1OHY8arklKdwtZ9n3NkjCeK8G9gtEe0ZSUwJuwHc6gYBl0uoC0Oa5RdpJV1gBBdXcZi8Efdw=="
+      "version": "2.21.1",
+      "resolved": "https://registry.npmjs.org/date-fns/-/date-fns-2.21.1.tgz",
+      "integrity": "sha512-m1WR0xGiC6j6jNFAyW4Nvh4WxAi4JF4w9jRJwSI8nBmNcyZXPcP9VUQG+6gHQXAmqaGEKDKhOqAtENDC941UkA=="
     },
     "date-fns-tz": {
       "version": "1.1.3",

package.json

@@ -10,7 +10,7 @@
     "test": "jest"
   },
   "dependencies": {
-    "date-fns": "^2.20.3",
+    "date-fns": "^2.21.1",
     "date-fns-tz": "^1.1.3",
     "ics": "^2.27.0",
     "mongoose": "^5.12.3",