workhorse: Update module gitlab.com/gitlab-org/gitaly/v15 to v15.9.3

This MR contains the following updates:

Package	Type	Update	Change
gitlab.com/gitlab-org/gitaly/v15	require	patch	v15.9.2 -> v15.9.3

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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Release Notes

gitlab-org/gitaly

v15.9.3

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