gitaly: Update server version to fix issues with RawChanges RPC

In f80312d8c (repository: Remove deprecated and unused fields from
GetRawChanges, 2021-11-11), Gitaly removed some deprecated fields from
the RawChanges RPC. As it turned out, these fields were still used by
the Elasticsearch indexer, whose tests subsequently broke. The change
was thus reverted via b17e6c876 (Revert "repository: Remove deprecated
and unused fields from GetRawChanges", 2021-11-16).

Upgrade the Gitaly server version to include this change to fix the
incompatibility.

GITALY_SERVER_VERSION

-fdad33ee98be7f2a33dd20587666e1995c3f6b5b
+8f04e23b9f004d70635aaeecd30d837a584572f8