remove unnecessary concurrent-ruby switch in gemspec (#2314)

Author: joelhawksley

view_component.gemspec

@@ -39,11 +39,7 @@ Gem::Specification.new do |spec|
 
   spec.add_runtime_dependency "activesupport", [">= 5.2.0", "< 8.1"]
   spec.add_runtime_dependency "method_source", "~> 1.0"
-  if ENV["RAILS_VERSION"] == "6.1"
-    spec.add_runtime_dependency "concurrent-ruby", "1.3.4" # lock version that supports Rails 6.1
-  else
-    spec.add_runtime_dependency "concurrent-ruby", "~> 1"
-  end
+  spec.add_runtime_dependency "concurrent-ruby", "~> 1"
   spec.add_development_dependency "allocation_stats", "~> 0.1.5"
   spec.add_development_dependency "appraisal", "~> 2.4"
   spec.add_development_dependency "benchmark-ips", "~> 2.13.0"