fix(client): send X-Stainless-Timeout in seconds (#104)

Author: stainless-app[bot]

src/client.ts

@@ -628,7 +628,7 @@ export class Stainless {
         Accept: 'application/json',
         'User-Agent': this.getUserAgent(),
         'X-Stainless-Retry-Count': String(retryCount),
-        ...(options.timeout ? { 'X-Stainless-Timeout': String(options.timeout) } : {}),
+        ...(options.timeout ? { 'X-Stainless-Timeout': String(Math.trunc(options.timeout / 1000)) } : {}),
         ...getPlatformHeaders(),
       },
       this.authHeaders(options),