gitaly: 1.72.1 -> a4b6c71d4b7c1588587345e2dfe0c6bd7cc63a83

For some reason this untagged commit is the one referred to in the
main repository; this might be a mistake, but we'll have to package it
for now to follow upstream.

pkgs/applications/version-management/gitlab/gitaly/Gemfile.lock

@@ -99,7 +99,7 @@ GEM
     licensee (8.9.2)
       rugged (~> 0.24)
     listen (0.5.3)
-    loofah (2.3.0)
+    loofah (2.3.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     memoizable (0.4.2)
@@ -111,7 +111,7 @@ GEM
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.11.3)
-    msgpack (1.3.0)
+    msgpack (1.3.1)
     multi_json (1.13.1)
     multipart-post (2.0.0)
     nokogiri (1.10.5)
@@ -176,7 +176,7 @@ GEM
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 1.7)
     ruby-progressbar (1.10.0)
-    rugged (0.28.3.1)
+    rugged (0.28.4.1)
     safe_yaml (1.0.5)
     sanitize (4.6.6)
       crass (~> 1.0.2)