test: add logger debug mock for provider retry

src/provider-retry.test.ts

@@ -2,6 +2,7 @@ import { beforeEach, describe, expect, it, vi } from 'vitest';
 
 vi.mock('./logger.js', () => ({
   logger: {
+    debug: vi.fn(),
     info: vi.fn(),
     warn: vi.fn(),
     error: vi.fn(),