Update ffi requirement from < 1.10.1 to < 1.11.2

Updates the requirements on [ffi](https://github.com/ffi/ffi) to permit the latest version.
- [Release notes](https://github.com/ffi/ffi/releases)
- [Changelog](https://github.com/ffi/ffi/blob/master/CHANGELOG.md)
- [Commits](ffi/ffi@0.1.0...1.11.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Gemfile

@@ -7,7 +7,7 @@ gem 'rest-client'
 gem 'os'
 gem 'rake'
 gem 'sys-proctable'
-gem 'ffi', '< 1.10.1'
+gem 'ffi', '< 1.11.2'
 gem 'pry'
 gem 'owasp_zap'
 gem 'site_prism'

Gemfile.lock

@@ -41,7 +41,7 @@ GEM
     domain_name (0.5.20180417)
       unf (>= 0.0.5, < 1.0.0)
     equalizer (0.0.11)
-    ffi (1.10.0)
+    ffi (1.11.1)
     gauge-ruby (0.5.2)
       debase (~> 0.2.2)
       grpc (~> 1.10, >= 1.10.0)
@@ -156,7 +156,7 @@ DEPENDENCIES
   childprocess
   clipboard (~> 1.3, >= 1.3.3)
   deep_merge
-  ffi (< 1.10.1)
+  ffi (< 1.11.2)
   gauge-ruby
   json_builder
   ladle