Update internal and external tests to use sus.

Author: ioquatix

config/external.yaml

@@ -1,9 +1,9 @@
 protocol-http1:
   url: https://github.com/socketry/protocol-http1.git
-  command: bundle exec rspec
+  command: bundle exec sus
 protocol-http2:
   url: https://github.com/socketry/protocol-http2.git
-  command: bundle exec rspec
+  command: bundle exec sus
 async-http:
   url: https://github.com/socketry/async-http.git
   command: bundle exec rspec

protocol-http.gemspec

@@ -21,5 +21,5 @@ Gem::Specification.new do |spec|
 
 	spec.add_development_dependency "bundler"
 	spec.add_development_dependency "covered"
-	spec.add_development_dependency "rspec"
+	spec.add_development_dependency "sus"
 end