sysutils/zfs-stats: Update to 1.3.2

[jbo]

Summary

Changelog: https://github.com/mmatuska/zfs-stats/compare/1.3.1...1.3.2

[jbo]

Maintainer didn't actually set maintainer-approval+ but commented "Approved" instead.
Not sure if that's a no-go.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273746#c1

[zirias]

No worries, when the intention to approve is clear, it's an approval. Approvals aren't bound to a specific process :)