Headers not present on some requests

[pcarn]

Version

Auto-Southwest Check-In v7.3 (develop branch)

Browser Version

Version 122.0.6261.129 (Official Build) (arm64)

Description

Continuing thread from #237

Sometimes the URL to set headers is not called, and it gets stuck on Waiting for headers_set to be set

This commit was added to help, but I still had a flight fail to check-in because it was stuck waiting for headers_set to be set.

If I can get it to happen again, I'll add logs again of what URLs are getting called.

To Reproduce

Not sure, it's intermittent. I have a user and password in my config file. It usually works fine, but sometimes will get stuck. It got stuck on an actual flight check-in the last time I tried.

Expected Behavior

It works normally.

Relevant logs and program output

2024-03-23 20:18:48 DEBUG Process-1[reservation_monitor:130]: Sleeping for 86356 seconds
2024-03-23 22:24:54 DEBUG Process-2:2[checkin_handler:100]: Acquiring lock...
2024-03-23 22:24:54 DEBUG Process-2:2[checkin_handler:102]: Lock acquired
2024-03-23 22:24:54 DEBUG Process-2:2[checkin_scheduler:51]: Refreshing headers for current session
2024-03-23 22:24:54 DEBUG Process-2:2[webdriver:109]: Starting webdriver for current session
2024-03-23 22:24:55 DEBUG Process-2:2[webdriver:125]: Using browser version: 122.0.6261.129
2024-03-23 22:24:55 DEBUG Process-2:2[webdriver:129]: Loading Southwest Check-In page
2024-03-23 22:24:56 DEBUG Process-2:2[webdriver:67]: Waiting for valid headers
2024-03-23 22:24:56 DEBUG Process-2:2[webdriver:158]: Waiting for headers_set to be set

### Additional context

_No response_