fix(webhooks): remove unintended rejectUnauthorized field from IMAP polling config

The refactored IMAP handler added a rejectUnauthorized field that was not
present in the original configureImapPolling function. This would default
to true for all existing IMAP webhooks, potentially breaking connections
to servers with self-signed certificates.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: waleedlatif1

apps/sim/lib/webhooks/providers/imap.ts

@@ -57,7 +57,6 @@ export const imapHandler: WebhookProviderHandler = {
             ...providerConfig,
             port: providerConfig.port || '993',
             secure: providerConfig.secure !== false,
-            rejectUnauthorized: providerConfig.rejectUnauthorized !== false,
             mailbox: providerConfig.mailbox || 'INBOX',
             searchCriteria: providerConfig.searchCriteria || 'UNSEEN',
             markAsRead: providerConfig.markAsRead || false,