Patch Bundler::Audit::Scanner to prevent network access

`Bundler::Audit::Scanner` uses `Resolv` in Ruby's standard library to determine
whether a source's host is internal. This is problematic during engine runs
because we currently block network access in containers.

This patches the scanner to always return `false` for `#internal_host?`.

Author: dblandin

lib/cc/engine/bundler_audit.rb

@@ -13,3 +13,12 @@ module BundlerAudit
     end
   end
 end
+
+# Patch Bundler::Audit::Scanner to prevent network access during insecure
+# source checks
+
+Bundler::Audit::Scanner.module_eval do
+  def internal_host?(_uri)
+    false
+  end
+end