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

The mentioned bug has been fixed in v5.14-rc1 and backported to the
stable kernels: 5.13.2, 5.12.17 and 5.10.50.

The newest archiso (shipped today) ships with 5.13.6.

[1] https://github.com/torvalds/linux/commit/2b9ac22b12a266eb4fec246a07b504dd4983b16b

Fix #139

This reverts commit 316d0523.
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