fix: Split long line in api_client.py to meet 100 char limit

Fixes ruff E501 line-too-long error on line 366 by splitting the
warning message across two lines using implicit string concatenation.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: samspade21

custom_components/vacasa/api_client.py

@@ -363,7 +363,8 @@ async def _request(
                                 # Log diagnostic info for troubleshooting
                                 response_text = await response.text()
                                 _LOGGER.warning(
-                                    "Failed to parse JSON from %s (content-type: %s): %s. Response: %s",
+                                    "Failed to parse JSON from %s (content-type: %s): %s. "
+                                    "Response: %s",
                                     url,
                                     response.content_type,
                                     e,