Bump acts-as-taggable-on gem version

Changelog: added

https://github.com/mbleigh/acts-as-taggable-on/blob/master/CHANGELOG.md

Gemfile

@@ -194,7 +194,7 @@ end
 gem 'state_machines-activerecord', '~> 0.8.0'
 
 # Issue tags
-gem 'acts-as-taggable-on', '~> 7.0'
+gem 'acts-as-taggable-on', '~> 8.1'
 
 # Background jobs
 gem 'sidekiq', '~> 6.3'

Gemfile.lock

@@ -73,7 +73,7 @@ GEM
       minitest (>= 5.1)
       tzinfo (~> 2.0)
       zeitwerk (~> 2.3)
-    acts-as-taggable-on (7.0.0)
+    acts-as-taggable-on (8.1.0)
       activerecord (>= 5.0, < 6.2)
     addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
@@ -1390,7 +1390,7 @@ DEPENDENCIES
   RedCloth (~> 4.3.2)
   acme-client (~> 2.0, >= 2.0.6)
   activerecord-explain-analyze (~> 0.1)
-  acts-as-taggable-on (~> 7.0)
+  acts-as-taggable-on (~> 8.1)
   addressable (~> 2.8)
   akismet (~> 3.0)
   apollo_upload_server (~> 2.1.0)