chore: bump version to 2.20.2 in package.json and update captcha integration across auth components (#405)

- Incremented application version from 2.20.1 to 2.20.2 in package.json.
- Added captchaSiteKey prop to SignUpPage for enhanced security.
- Refactored captcha field rendering in various authentication components to ensure consistent placement and functionality.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "next-supabase-saas-kit-turbo",
-  "version": "2.20.1",
+  "version": "2.20.2",
   "private": true,
   "sideEffects": false,
   "engines": {