fix: upgrade @umbraco-cms/backoffice from 15.2.1 to 15.2.2

Snyk has created this PR to upgrade @umbraco-cms/backoffice from 15.2.1 to 15.2.2.

See this package in npm:
@umbraco-cms/backoffice

See this project in Snyk:
https://app.snyk.io/org/jcdcdev/project/68c3140b-c488-4260-bfb5-075adc2bb8f0?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

src/jcdcdev.Umbraco.ExtendedMarkdownEditor.Client/package-lock.json

@@ -12,7 +12,7 @@
         "lit": "^3.2.1"
     },
     "devDependencies": {
-        "@umbraco-cms/backoffice": "^15.2.1",
+        "@umbraco-cms/backoffice": "^15.2.2",
         "typescript": "^5.6.3",
         "vite": "^5.4.14"
     },