devel/lab: update to 0.25.2.0.20230225220034

This is an intermediate version right after 0.25.1,
holding an update of golang.org/x/sys needed to enable
the build on riscv64.

Changelog: https://github.com/zaquestion/lab/releases/tag/v0.25.1

Sponsored by: Berliner Linux User Group e.V.
Approved by: swills (maintainer)
Approved by: eduardo (mentor)
Differential Revision: https://reviews.freebsd.org/D38867