chore: bump version to 2.21.6 in package.json and enhance captcha integration across auth components (#418)

- Updated application version from 2.21.4 to 2.21.6 in package.json.
- Added "verifyingCaptcha" message to auth.json for improved user feedback during captcha verification.
- Enhanced captcha handling in various authentication components, including MagicLinkAuthContainer, PasswordResetRequestContainer, and SignUpContainer, to reflect loading states and improve user experience.

packages/features/auth/src/components/password-sign-in-container.tsx

@@ -24,6 +24,7 @@ export function PasswordSignInContainer({
   const { recordAuthMethod } = useLastAuthMethod();
   const isLoading = signInMutation.isPending;
   const isRedirecting = signInMutation.isSuccess;
+  const captchaLoading = !captcha.isReady;
 
   const onSubmit = useCallback(
     async (credentials: z.infer<typeof PasswordSignInSchema>) => {
@@ -59,6 +60,7 @@ export function PasswordSignInContainer({
           onSubmit={onSubmit}
           loading={isLoading}
           redirecting={isRedirecting}
+          captchaLoading={captchaLoading}
         />
 
         {captcha.field}