[utils] Fix non-blocking only filesystems

[Eveldee]

This workaround is needed for some filesystems like virtiofs where any file locking or unlocking operation must be non-blocking

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Description of your pull request and other information

This PR adds a workaround for the file unlocking operation on some filesystems like virtiofs by adding the UNLOCK_NB flag on error.

Fixes #6823

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[brandon-dacrib]

this fix works for me on using virtiofs with a vm under unraid. I do have a different problem 2023-04-29 18:43:34,875 - sonarr_youtubedl - ERROR - Failed - TBA - Replacement index 1 out of range for positional args tuple but I think it is unrelated.