Bump aasm from 4.12.3 to 5.1.1

Bumps [aasm](https://github.com/aasm/aasm) from 4.12.3 to 5.1.1.
- [Release notes](https://github.com/aasm/aasm/releases)
- [Changelog](https://github.com/aasm/aasm/blob/master/CHANGELOG.md)
- [Commits](https://github.com/aasm/aasm/compare/v4.12.3...v5.1.1)

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile

@@ -29,7 +29,7 @@ gem "RedCloth"
 gem "sanitize", "~> 5.2"
 gem "will_paginate"
 gem "acts_as_list"
-gem "aasm", '~> 4.12.3'
+gem "aasm", '~> 5.1.1'
 gem "htmlentities"
 gem "rails_autolink"
 gem 'puma', '~> 4.3'

Gemfile.lock

@@ -9,7 +9,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     RedCloth (4.3.2)
-    aasm (4.12.3)
+    aasm (5.1.1)
       concurrent-ruby (~> 1.0)
     actioncable (5.2.4.3)
       actionpack (= 5.2.4.3)
@@ -87,7 +87,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.1.6)
+    concurrent-ruby (1.1.7)
     crass (1.0.6)
     database_cleaner (1.8.5)
     diff-lcs (1.3)
@@ -294,7 +294,7 @@ PLATFORMS
 
 DEPENDENCIES
   RedCloth
-  aasm (~> 4.12.3)
+  aasm (~> 5.1.1)
   actionpack-xml_parser (~> 2.0)
   activemodel-serializers-xml (~> 1.0.1)
   acts_as_list