Bump Gitaly to 0.117.0

Adds support for deferred loading of Wiki data.

See https://gitlab.com/gitlab-org/gitaly/blob/master/CHANGELOG.md for
more details.

GITALY_SERVER_VERSION

-0.115.0
+0.117.0

changelogs/unreleased/sh-bump-gitaly-0-117.yml

+---
+title: Bump Gitaly to 0.117.0
+merge_request: 21055
+author:
+type: performance