Bump the dev-dependencies group with 2 updates

Bumps the dev-dependencies group with 2 updates: [@mui/x-charts](https://github.com/mui/mui-x/tree/HEAD/packages/x-charts) and [ical-generator](https://github.com/sebbo2002/ical-generator).


Updates `@mui/x-charts` from 7.23.2 to 7.23.6
- [Release notes](https://github.com/mui/mui-x/releases)
- [Changelog](https://github.com/mui/mui-x/blob/v7.23.6/CHANGELOG.md)
- [Commits](https://github.com/mui/mui-x/commits/v7.23.6/packages/x-charts)

Updates `ical-generator` from 8.0.1 to 8.1.0
- [Release notes](https://github.com/sebbo2002/ical-generator/releases)
- [Changelog](https://github.com/sebbo2002/ical-generator/blob/develop/CHANGELOG.md)
- [Commits](sebbo2002/ical-generator@v8.0.1...v8.1.0)

---
updated-dependencies:
- dependency-name: "@mui/x-charts"
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dev-dependencies
- dependency-name: ical-generator
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dev-dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -16,14 +16,14 @@
     "@markdoc/markdoc": "^0.4.0",
     "@mui/material": "^6.3.1",
     "@mui/system": "^6.0.1",
-    "@mui/x-charts": "^7.23.2",
+    "@mui/x-charts": "^7.23.6",
     "@sendgrid/mail": "^8.1.4",
     "@slack/web-api": "^7.8.0",
     "@vercel/blob": "^0.27.0",
     "@vercel/functions": "^1.5.2",
     "airtable": "^0.12.2",
     "clsx": "^2.1.1",
-    "ical-generator": "^8.0.1",
+    "ical-generator": "^8.1.0",
     "next": "14.2.23",
     "next-auth": "^4.24.11",
     "plausible-tracker": "^0.3.9",