[Feature] Make firmware update checker aware of selected branch (stable vs. LTS)

[bekesizl]

Is your feature request related to a problem? Please describe.

I am using the LTS/long-term firmware branch from Mikrotik.
It is getting slower updates and is at different verison number, then the stable branch.
But I am still getting notifications, if there is a new version in the stable branch.

Describe the solution you'd like

If possible, make the firmware update checker aware to the selected firmware branch and give only update notification, if there is a new version from the chosen branch available.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[github-actions]

This issue was closed because it has been stalled for 5 days with no activity.