Update Gitaly version to 15.0.0

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Update Gitaly version to 15.0.0
a87ac3b9 · GitLab Release Tools Bot · 639c2a19 · a87ac3b9
Commit a87ac3b9 authored 2 years ago by GitLab Release Tools Bot
--- a/GITALY_SERVER_VERSION
+++ b/GITALY_SERVER_VERSION
-2106629e3af3e8949b23f20825d6bfee62c10992
+15.0.0
\ No newline at end of file