chore(deps): bump sinatra from 3.0.5 to 3.0.6 in /tests/apps/ruby

Bumps [sinatra](https://github.com/sinatra/sinatra) from 3.0.5 to 3.0.6.
- [Release notes](https://github.com/sinatra/sinatra/releases)
- [Changelog](https://github.com/sinatra/sinatra/blob/main/CHANGELOG.md)
- [Commits](https://github.com/sinatra/sinatra/compare/v3.0.5...v3.0.6)

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

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', '~>3.0.5'
+gem 'sinatra', '~>3.0.6'
 gem 'thin'

tests/apps/ruby/Gemfile.lock

@@ -6,23 +6,23 @@ GEM
     mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     rack (2.2.6.4)
-    rack-protection (3.0.5)
+    rack-protection (3.0.6)
       rack
     ruby2_keywords (0.0.5)
-    sinatra (3.0.5)
+    sinatra (3.0.6)
       mustermann (~> 3.0)
       rack (~> 2.2, >= 2.2.4)
-      rack-protection (= 3.0.5)
+      rack-protection (= 3.0.6)
       tilt (~> 2.0)
     thin (1.8.2)
       daemons (~> 1.0, >= 1.0.9)
       eventmachine (~> 1.0, >= 1.0.4)
       rack (>= 1, < 3)
-    tilt (2.0.11)
+    tilt (2.1.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  sinatra (~> 3.0.5)
+  sinatra (~> 3.0.6)
   thin