Update acme-client to v2.0.9

This brings in Ruby 3.0 support and other minor fixes. This also matches
the version already used by Omnibus
(https://gitlab.com/gitlab-org/omnibus-gitlab/-/merge_requests/5590).

Diff: https://my.diffend.io/gems/acme-client/2.0.6/2.0.9

Changelog: fixed

Gemfile

@@ -74,7 +74,7 @@ gem 'u2f', '~> 0.2.1'
 gem 'validates_hostname', '~> 1.0.11'
 gem 'rubyzip', '~> 2.0.0', require: 'zip'
 # GitLab Pages letsencrypt support
-gem 'acme-client', '~> 2.0', '>= 2.0.6'
+gem 'acme-client', '~> 2.0', '>= 2.0.9'
 
 # Browser detection
 gem 'browser', '~> 4.2'

Gemfile.lock

@@ -9,7 +9,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     RedCloth (4.3.2)
-    acme-client (2.0.6)
+    acme-client (2.0.9)
       faraday (>= 0.17, < 2.0.0)
     actioncable (6.1.4.1)
       actionpack (= 6.1.4.1)
@@ -1388,7 +1388,7 @@ PLATFORMS
 
 DEPENDENCIES
   RedCloth (~> 4.3.2)
-  acme-client (~> 2.0, >= 2.0.6)
+  acme-client (~> 2.0, >= 2.0.9)
   activerecord-explain-analyze (~> 0.1)
   acts-as-taggable-on (~> 8.1)
   addressable (~> 2.8)