biology/diamond: Update to version 0.8.31.

Upstream changelog:

• Added compositional score adjustments (option --comp-based-stats (0,1)). This is a useful feature for filtering false positive hits and is enabled by default.
• Removed --single-domain option and replaced by --max-hsps, to set the maximum number of Hsps per query/subject pair, to be consistent with BLAST. This option is set to 1 by default as getting more than 1 Hsp per subject seems to be confusing users.
• Added option --no-self-hits to filter identical self-hits.

Approved by: AMDmi3 (mentor)
Differential Revision: https://reviews.freebsd.org/D9134