Bump sinatra and rack in /examples/sinatra

Bumps [sinatra](https://github.com/sinatra/sinatra) and [rack](https://github.com/rack/rack). These dependencies needed to be updated together.

Updates `sinatra` from 1.0 to 4.1.1
- [Changelog](https://github.com/sinatra/sinatra/blob/main/CHANGELOG.md)
- [Commits](sinatra/sinatra@1.0...v4.1.1)

Updates `rack` from 2.2.14 to 3.2.0
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v2.2.14...v3.2.0)

---
updated-dependencies:
- dependency-name: sinatra
  dependency-version: 4.1.1
  dependency-type: direct:production
- dependency-name: rack
  dependency-version: 3.2.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

examples/sinatra/Gemfile

@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem 'sinatra', '< 4.0'
+gem 'sinatra', '< 5.0'
 gem 'webrick'
 gem "jruby-rack", "~> 1.2"
-gem 'rack', '2.2.14'
+gem 'rack', '3.2.0'

examples/sinatra/Gemfile.lock

@@ -1,10 +1,28 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    base64 (0.3.0)
     jruby-rack (1.2.4)
-    rack (2.2.14)
-    sinatra (1.0)
-      rack (>= 1.0)
+    logger (1.7.0)
+    mustermann (3.0.4)
+      ruby2_keywords (~> 0.0.1)
+    rack (3.2.0)
+    rack-protection (4.1.1)
+      base64 (>= 0.1.0)
+      logger (>= 1.6.0)
+      rack (>= 3.0.0, < 4)
+    rack-session (2.1.1)
+      base64 (>= 0.1.0)
+      rack (>= 3.0.0)
+    ruby2_keywords (0.0.5)
+    sinatra (4.1.1)
+      logger (>= 1.6.0)
+      mustermann (~> 3.0)
+      rack (>= 3.0.0, < 4)
+      rack-protection (= 4.1.1)
+      rack-session (>= 2.0.0, < 3)
+      tilt (~> 2.0)
+    tilt (2.6.1)
     webrick (1.9.1)
 
 PLATFORMS
@@ -13,6 +31,6 @@ PLATFORMS
 
 DEPENDENCIES
   jruby-rack (~> 1.2)
-  rack (= 2.2.14)
-  sinatra (< 4.0)
+  rack (= 3.2.0)
+  sinatra (< 5.0)
   webrick