Add a Gemfile lock for SAST enable test

Add a Gemfile.lock for the SAST enable test fixture.
It was reported that this would be auto-generated by
Rubymine.

The contents of Gemfile are non-functional, the test
functions correctly with the presence of a Gemfile
even with no Gems specified.

qa/qa/ee/fixtures/secure_sast_enable_from_ui_files/Gemfile

 # frozen_string_literal: true
-
-source 'https://rubygems.org'
-
-gem 'pry'

qa/qa/ee/fixtures/secure_sast_enable_from_ui_files/Gemfile.lock

+GEM
+  specs:
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+
+BUNDLED WITH
+   2.1.4