fix: correct Guzzle namespace references in exception handling

Regenerated SDK with fixed nextlove-sdk-generator that properly escapes
backslashes in template literals for PHP namespace references.

Fixes the "Class Seam\GuzzleHttpExceptionRequestException not found"
fatal error when handling Guzzle exceptions.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: dawnho