community/shunit2: upgrade to 2.1.8
I tested this version in one of my projects, it works fine: https://github.com/williamdes/sql-backup/commit/c7183ad066ad6a1ac656303749ec2691a8f4c49c
https://github.com/kward/shunit2/releases/tag/v2.1.8
https://github.com/kward/shunit2/blob/master/doc/RELEASE_NOTES-2.1.8.md
Tests seem to fail: https://gitlab.alpinelinux.org/williamdes/aports/-/jobs/272035#L121 A file was removed or ?, I need to search and fix that
Edited by William Desportes