fix: upgrade typescript from 5.9.2 to 5.9.3

Snyk has created this PR to upgrade typescript from 5.9.2 to 5.9.3.

See this package in npm:
typescript

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

@@ -13,7 +13,7 @@
     },
     "devDependencies": {
         "@umbraco-cms/backoffice": "^15.4.4",
-        "typescript": "^5.9.2",
+        "typescript": "^5.9.3",
         "vite": "^7.1.11"
     },
     "volta": {