Merge branch 'gitaly-version-v1.59.0' into 'master'

Upgrade Gitaly to v1.59.0

See merge request gitlab-org/gitlab-ce!31743

GITALY_SERVER_VERSION

-1.58.0
+1.59.0
\ No newline at end of file

changelogs/unreleased/gitaly-version-v1.59.0.yml

+---
+title: Upgrade to Gitaly v1.59.0
+merge_request: 31743
+author:
+type: changed

lib/feature/gitaly.rb

@@ -7,7 +7,7 @@ class Feature
     # Server feature flags should use '_' to separate words.
     SERVER_FEATURE_FLAGS =
       [
-        'get_commit_signatures'.freeze
+        # 'get_commit_signatures'.freeze
       ].freeze
 
     DEFAULT_ON_FLAGS = Set.new([]).freeze