Upgrade acme-client to v2.0.5

Let's Encrypt dropped support of unauthenticated GET requests to their
staging API. This version uses POST-as-GET requests, which is the
recommended method.

This mirrors the change in Omnibus:
https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/3782

Full CHANGELOG:
https://github.com/unixcharles/acme-client/blob/master/CHANGELOG.md

Diff:
https://github.com/unixcharles/acme-client/compare/v2.0.2..v2.0.5

Gemfile

@@ -67,7 +67,7 @@ gem 'u2f', '~> 0.2.1'
 gem 'validates_hostname', '~> 1.0.6'
 gem 'rubyzip', '~> 1.3.0', require: 'zip'
 # GitLab Pages letsencrypt support
-gem 'acme-client', '~> 2.0.2'
+gem 'acme-client', '~> 2.0.5'
 
 # Browser detection
 gem 'browser', '~> 2.5'

Gemfile.lock

@@ -4,7 +4,7 @@ GEM
     RedCloth (4.3.2)
     abstract_type (0.0.7)
     ace-rails-ap (4.1.2)
-    acme-client (2.0.2)
+    acme-client (2.0.5)
       faraday (~> 0.9, >= 0.9.1)
     actioncable (5.2.3)
       actionpack (= 5.2.3)
@@ -1131,7 +1131,7 @@ PLATFORMS
 DEPENDENCIES
   RedCloth (~> 4.3.2)
   ace-rails-ap (~> 4.1.0)
-  acme-client (~> 2.0.2)
+  acme-client (~> 2.0.5)
   activerecord-explain-analyze (~> 0.1)
   acts-as-taggable-on (~> 6.0)
   addressable (~> 2.7)

changelogs/unreleased/sh-update-acme-client.yml

+---
+title: Upgrade acme-client to v2.0.5
+merge_request: 23498
+author:
+type: other