workhorse: Update module github.com/stretchr/testify to v1.8.4

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{"labels":["maintenance::dependency","type::maintenance","automation:bot-authored","workhorse","section::dev"],"assignees":["gitlab-dependency-update-bot"],"reviewers":["ashmckenzie","vyaklushin"]}

assigned to @gitlab-dependency-update-bot

added 1 commit

d8fb0d86 - workhorse: Update module github.com/stretchr/testify to v1.8.4

Compare with previous version

mentioned in issue #366369

added automation:bot-authored maintenancedependency sectiondev typemaintenance workhorse labels

requested review from @ashmckenzie

changed milestone to %16.1

approved this merge request

https://github.com/stretchr/testify/compare/v1.8.3...v1.8.4 is an internal project change (to .github/workflows/release.yml), so no functional change here.