Change http gem constraint to allow for v6

The http gem v6.x is Ruby 3.2 and up only, so the constraint here
should allow for installation of v5 on older Ruby versions and v6
on newer.

See-also: https://github.com/httprb/http/blob/v6.0.3/CHANGELOG.md

Author: jgarber623

Gemfile.lock

@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     indieweb-endpoints (10.0.2)
-      http (~> 5.3)
+      http (>= 5.3)
       link-header-parser (~> 7.0, >= 7.0.1)
       nokogiri-html-ext (~> 1.7)
 

indieweb-endpoints.gemspec

@@ -28,7 +28,7 @@ Gem::Specification.new do |spec|
     "source_code_uri" => "#{spec.homepage}/tree/v#{spec.version}",
   }
 
-  spec.add_dependency "http", "~> 5.3"
+  spec.add_dependency "http", ">= 5.3"
   spec.add_dependency "link-header-parser", "~> 7.0", ">= 7.0.1"
   spec.add_dependency "nokogiri-html-ext", "~> 1.7"
 end