Add conditional development dependency on mutex_m

orien · orien · commit d37fa8e0f8bd · 2024-02-20T03:28:58.000+11:00
diff --git a/Gemfile b/Gemfile
@@ -24,3 +24,7 @@ end
 platforms :jruby do
   gem 'jruby-openssl'
 end
+
+if RUBY_VERSION >= '3.4'
+  gem 'mutex_m' # TODO: remove this once as-notifications has such a dependency
+end
