Update bcrypt to its latest stable

Author: mitio

Gemfile.lock

@@ -66,7 +66,7 @@ GEM
     aws-sdk-v1 (1.63.0)
       json (~> 1.4)
       nokogiri (>= 1.4.4)
-    bcrypt (3.1.10)
+    bcrypt (3.1.18)
     binding_of_caller (0.7.2)
       debug_inspector (>= 0.0.1)
     bourbon (7.2.0)