sshfs: Update to version 3.7.3

sshfs: Update to version 3.7.3

- Update from version 3.7.2 to 3.7.3 (May 2022)
- Update of rootfile not required
- Changelog
    3.7.3
	* Minor bugfixes.
	* This is the last release from the current maintainer. SSHFS is now no longer
	   maintained or developed. Github issue tracking and pull requests have
	   therefore been disabled. The mailing list (see below) is still available for
	   use.
	  If you would like to take over this project, you are welcome to do so. Please
	   fork it
	   and develop the fork for a while. Once there has been 6 months of reasonable
	   activity, please contact Nikolaus@rath.org and I'll be happy to give you
	   ownership of this repository or replace with a pointer to the fork.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>