fix sorbet with puma shim

Author: ndbroadbent

sorbet/rbi/shims/puma.rbi

@@ -0,0 +1,9 @@
+# typed: true
+
+# Stub for Puma gem - used for server detection
+module Puma
+  class CLI; end
+  class Server
+    def self.current; end
+  end
+end