Bump luxon from 3.4.4 to 3.7.2 (#128)

Bumps [luxon](https://github.com/moment/luxon) from 3.4.4 to 3.7.2.
- [Changelog](https://github.com/moment/luxon/blob/master/CHANGELOG.md)
- [Commits](moment/luxon@3.4.4...3.7.2)

---
updated-dependencies:
- dependency-name: luxon
  dependency-version: 3.7.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -21,7 +21,7 @@
     "govuk-frontend": "4.7.0",
     "govuk-prototype-kit": "13.20.0",
     "gray-matter": "^4.0.3",
-    "luxon": "^3.4.4",
+    "luxon": "^3.7.2",
     "marked": "^9.1.6",
     "marked-gfm-heading-id": "^3.1.3",
     "numeral": "^2.0.6",