chore(vscode): remove deprecated git.autofetchPeriod setting

The `git.autofetchPeriod` setting is removed as it is deprecated and no longer necessary. The `git.autofetch` setting is sufficient to handle automatic fetching, and removing the deprecated setting helps maintain a clean and up-to-date configuration.

Author: kzndotsh

.vscode/settings.json

@@ -38,7 +38,6 @@
     "build/**": true
   },
   "git.autofetch": true,
-  "git.autofetchPeriod": 180,
   "git.pruneOnFetch": true,
   "git.showProgress": true,
   "git.fetchOnPull": true,