chore: bump version to 2.21.2 in package.json and update feature flags for account settings (#412)

- Incremented application version from 2.21.0 to 2.21.2 in package.json.
- Added logic to conditionally show email option in account settings based on enabled authentication methods.
- Updated PersonalAccountSettingsContainer to utilize the new showLinkEmailOption feature flag.
- Refactored migration script to correct delimiter usage for better parsing of migration lines.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "next-supabase-saas-kit-turbo",
-  "version": "2.21.0",
+  "version": "2.21.2",
   "private": true,
   "sideEffects": false,
   "engines": {