Update Gitaly version to 13.12.2

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Update Gitaly version to 13.12.2
e3bea1f5 · GitLab Release Tools Bot · 1cf228ab · e3bea1f5
Commit e3bea1f5 authored 3 years ago by GitLab Release Tools Bot
--- a/GITALY_SERVER_VERSION
+++ b/GITALY_SERVER_VERSION
-13.12.1
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+13.12.2
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