Upgrade to mantic-proposed zfs

[codecov-commenter]

Codecov Report

Merging #249 (a9b52de) into master (e2ff1bb) will decrease coverage by 0.08%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #249      +/-   ##
==========================================
- Coverage   75.89%   75.82%   -0.08%     
==========================================
  Files          24       24              
  Lines        4058     4058              
==========================================
- Hits         3080     3077       -3     
- Misses        878      880       +2     
- Partials      100      101       +1     

see 1 file with indirect coverage changes

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[xnox]

this passed manual run with system zfs on mantic VM with proposed enabled. This should be good enough to upload into mantic.

Once it migrates, I should figure out working CI for it.