fix: explicitly cast the platform string to a Gem::Platform

to work around rubygems/rubygems#5938

Closes #200

Author: flavorjones

lib/tailwindcss/commands.rb

@@ -18,15 +18,15 @@ def platform
       def executable(
         exe_path: File.expand_path(File.join(__dir__, "..", "..", "exe"))
       )
-        if Tailwindcss::Upstream::NATIVE_PLATFORMS.keys.none? { |p| Gem::Platform.match(p) }
+        if Tailwindcss::Upstream::NATIVE_PLATFORMS.keys.none? { |p| Gem::Platform.match(Gem::Platform.new(p)) }
           raise UnsupportedPlatformException, <<~MESSAGE
             tailwindcss-rails does not support the #{platform} platform
             Please install tailwindcss following instructions at https://tailwindcss.com/docs/installation
           MESSAGE
         end
 
         exe_path = Dir.glob(File.expand_path(File.join(exe_path, "*", "tailwindcss"))).find do |f|
-          Gem::Platform.match(File.basename(File.dirname(f)))
+          Gem::Platform.match(Gem::Platform.new(File.basename(File.dirname(f))))
         end
 
         if exe_path.nil?