Increase firmware upload timeout from 120s to 600s

A 27 MB firmware file can take well over 2 minutes for the IOM BMC to
receive and acknowledge, especially if it processes the file before
responding. 600 seconds (10 minutes) gives enough headroom.

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

modules/redfish.py

@@ -93,7 +93,7 @@ def _redfish_upload_firmware(password: str, host: str, fw_path: str) -> tuple:
         },
     )
     try:
-        with urllib.request.urlopen(req, context=ctx, timeout=120) as resp:
+        with urllib.request.urlopen(req, context=ctx, timeout=600) as resp:
             raw = resp.read().decode("utf-8", errors="replace")
             try:
                 return True, json.loads(raw) if raw.strip() else {}