chore(deps): bump thin from 1.6.1 to 1.7.2 in /tests/apps/ruby

Bumps [thin](https://github.com/macournoyer/thin) from 1.6.1 to 1.7.2.
- [Release notes](https://github.com/macournoyer/thin/releases)
- [Changelog](https://github.com/macournoyer/thin/blob/master/CHANGELOG)
- [Commits](https://github.com/macournoyer/thin/compare/v1.6.1...v1.7.2)

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

tests/apps/ruby/Gemfile.lock

@@ -1,19 +1,19 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    daemons (1.1.9)
-    eventmachine (1.0.3)
-    rack (1.5.2)
+    daemons (1.3.1)
+    eventmachine (1.2.7)
+    rack (1.6.11)
     rack-protection (1.5.2)
       rack
     sinatra (1.4.4)
       rack (~> 1.4)
       rack-protection (~> 1.4)
       tilt (~> 1.3, >= 1.3.4)
-    thin (1.6.1)
-      daemons (>= 1.0.9)
-      eventmachine (>= 1.0.0)
-      rack (>= 1.0.0)
+    thin (1.7.2)
+      daemons (~> 1.0, >= 1.0.9)
+      eventmachine (~> 1.0, >= 1.0.4)
+      rack (>= 1, < 3)
     tilt (1.4.1)
 
 PLATFORMS