chore(deps): bump sinatra from 2.1.0 to 2.2.0 in /tests/apps/ruby

Bumps [sinatra](https://github.com/sinatra/sinatra) from 2.1.0 to 2.2.0.
- [Release notes](https://github.com/sinatra/sinatra/releases)
- [Changelog](https://github.com/sinatra/sinatra/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sinatra/sinatra/compare/v2.1.0...v2.2.0)

---
updated-dependencies:
- dependency-name: sinatra
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

tests/apps/ruby/Gemfile

@@ -1,5 +1,5 @@
 source 'https://rubygems.org'
 ruby '2.6.8'
 
-gem 'sinatra', '~>2.1.0'
+gem 'sinatra', '~>2.2.0'
 gem 'thin'

tests/apps/ruby/Gemfile.lock

@@ -6,13 +6,13 @@ GEM
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
     rack (2.2.3)
-    rack-protection (2.1.0)
+    rack-protection (2.2.0)
       rack
-    ruby2_keywords (0.0.2)
-    sinatra (2.1.0)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.0)
       mustermann (~> 1.0)
       rack (~> 2.2)
-      rack-protection (= 2.1.0)
+      rack-protection (= 2.2.0)
       tilt (~> 2.0)
     thin (1.8.1)
       daemons (~> 1.0, >= 1.0.9)
@@ -24,5 +24,5 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  sinatra (~> 2.1.0)
+  sinatra (~> 2.2.0)
   thin