Bump sinatra from 2.2.0 to 2.2.3 in /yaml/yaml2

Bumps [sinatra](https://github.com/sinatra/sinatra) from 2.2.0 to 2.2.3.
- [Release notes](https://github.com/sinatra/sinatra/releases)
- [Changelog](https://github.com/sinatra/sinatra/blob/master/CHANGELOG.md)
- [Commits](sinatra/sinatra@v2.2.0...v2.2.3)

---
updated-dependencies:
- dependency-name: sinatra
  dependency-type: direct:production
...

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

yaml/yaml2/Gemfile

@@ -1,3 +1,3 @@
 source 'https://rubygems.org/'
 
-gem 'sinatra', '~> 2.2.0'
+gem 'sinatra', '~> 2.2.3'

yaml/yaml2/Gemfile.lock

@@ -1,24 +1,24 @@
 GEM
  remote: https://rubygems.org/
  specs:
- mustermann (1.1.1)
+ mustermann (2.0.2)
  ruby2_keywords (~> 0.0.1)
  rack (2.2.6.2)
- rack-protection (2.2.0)
+ rack-protection (2.2.3)
  rack
  ruby2_keywords (0.0.5)
- sinatra (2.2.0)
- mustermann (~> 1.0)
+ sinatra (2.2.3)
+ mustermann (~> 2.0)
  rack (~> 2.2)
- rack-protection (= 2.2.0)
+ rack-protection (= 2.2.3)
  tilt (~> 2.0)
- tilt (2.0.10)
+ tilt (2.0.11)
 
 PLATFORMS
  ruby
 
 DEPENDENCIES
- sinatra (~> 2.2.0)
+ sinatra (~> 2.2.3)
 
 BUNDLED WITH
  1.16.2