fix(deps): bump luxon and @types/luxon

Bumps [luxon](https://github.com/moment/luxon) and [@types/luxon](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/luxon). These dependencies needed to be updated together.

Updates `luxon` from 2.3.2 to 2.4.0
- [Release notes](https://github.com/moment/luxon/releases)
- [Changelog](https://github.com/moment/luxon/blob/master/CHANGELOG.md)
- [Commits](moment/luxon@2.3.2...2.4.0)

Updates `@types/luxon` from 2.3.1 to 2.3.2
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/luxon)

---
updated-dependencies:
- dependency-name: luxon
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: "@types/luxon"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

packages/backend/package.json

@@ -55,7 +55,7 @@
     "knex": "0.21.19",
     "knex-migrate-sql-file": "1.0.3",
     "lodash": "4.17.21",
-    "luxon": "2.3.2",
+    "luxon": "2.4.0",
     "mime": "3.0.0",
     "module-alias": "2.2.2",
     "nanoid": "3.3.3",
@@ -90,7 +90,7 @@
     "@types/js-yaml": "4.0.5",
     "@types/jsonfile": "6.1.0",
     "@types/lodash": "4.14.182",
-    "@types/luxon": "2.3.1",
+    "@types/luxon": "2.3.2",
     "@types/mime": "2.0.3",
     "@types/module-alias": "2.0.1",
     "@types/node": "16.11.33",

packages/frontend/package.json

@@ -25,7 +25,7 @@
     "immer": "9.0.12",
     "katex": "0.15.3",
     "lodash": "4.17.21",
-    "luxon": "2.3.2",
+    "luxon": "2.4.0",
     "mdast-util-find-and-replace": "2.1.0",
     "nanoid": "3.3.3",
     "node-emoji": "1.11.0",
@@ -76,7 +76,7 @@
     "@testing-library/react": "12.1.4",
     "@testing-library/user-event": "14.1.1",
     "@types/jest": "27.4.1",
-    "@types/luxon": "2.3.1",
+    "@types/luxon": "2.3.2",
     "@types/node-emoji": "1.8.1",
     "@types/parsimmon": "1.10.6",
     "@types/react": "17.0.42",