fix: upgrade @umbraco-cms/backoffice from 16.3.1 to 16.3.3

Snyk has created this PR to upgrade @umbraco-cms/backoffice from 16.3.1 to 16.3.3.

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

See this project in Snyk:
https://app.snyk.io/org/jcdcdev/project/75226e0e-11c9-4207-9d37-c10025a42b1e?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": "^3.3.1"
     },
     "devDependencies": {
-        "@umbraco-cms/backoffice": "^16.3.1",
+        "@umbraco-cms/backoffice": "^16.3.3",
         "typescript": "^5.9.3",
         "vite": "^7.1.11"
     },