fix: src/jcdcdev.Umbraco.ExtendedMarkdownEditor.Client/package.json & src/jcdcdev.Umbraco.ExtendedMarkdownEditor.Client/package-lock.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-VITE-9919777

Author: snyk-bot

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

@@ -14,7 +14,7 @@
     "devDependencies": {
         "@umbraco-cms/backoffice": "^15.3.1",
         "typescript": "^5.8.3",
-        "vite": "^6.3.2"
+        "vite": "^6.3.4"
     },
     "volta": {
         "node": "22.14.0"