Update sinatra-contrib requirement from ~> 2.2.3 to >= 2.2.3, < 3.2.0 (…

…#45)

Updates the requirements on [sinatra-contrib](https://github.com/sinatra/sinatra) to permit the latest version.
- [Changelog](https://github.com/sinatra/sinatra/blob/main/CHANGELOG.md)
- [Commits](sinatra/sinatra@v2.2.3...v3.1.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

stoplight-admin.gemspec

@@ -27,6 +27,6 @@ Gem::Specification.new do |gem|
 
   gem.add_dependency "redis", ">= 3.2"
   gem.add_dependency "zeitwerk"
-  gem.add_dependency "sinatra-contrib", "~> 2.2.3"
+  gem.add_dependency "sinatra-contrib", ">= 2.2.3", "< 3.2.0"
   gem.add_dependency "stoplight", ">= 4.1"
 end