Downgrade to util-linux v2.36 to workaround kernel bug

losetup (>=2.37)[1] uses the LOOP_CONFIGURE ioctl which discard support
is broken[2].

[1] https://github.com/karelzak/util-linux/pull/1152
[2] https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/commit/?h=for-5.14/drivers&id=2b9ac22b12a266eb4fec246a07b504dd4983b16b

Fix #138
6 jobs for util-linux-downgrade in 24 minutes and 59 seconds (queued for 4 seconds)