fix: upgrade moment from 2.29.2 to 2.29.3 (#354)

Snyk has created this PR to upgrade moment from 2.29.2 to 2.29.3.

See this package in npm:
https://www.npmjs.com/package/moment

See this project in Snyk:
https://app.snyk.io/org/simonsmoj/project/0ed78a30-8c4f-4949-87c3-404d8921ac5e?utm_source=github&utm_medium=referral&page=upgrade-pr

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

package.json

@@ -44,7 +44,7 @@
     "gulp-concat": "^2.6.1",
     "gulp-imagemin": "^8.0.0",
     "gulp-umd": "^2.0.0",
-    "moment": "^2.29.2",
+    "moment": "^2.29.3",
     "nunjucks": "^3.2.3",
     "require-dir": "^1.2.0",
     "sass": "^1.49.9"