fix failing test in new versions of the bundler

In bundler 2.4.6 a change was made to reset the bundler environment. We think previously the gemspec wasn't being loaded but since it was already in the environment it didn't matter.

Author: jsonbailey

spec/launchdarkly-server-sdk_spec_autoloadtest.rb

@@ -1,8 +1,8 @@
-require "bundler/setup"
 require "bundler/inline"
 
 gemfile do
-  gem "launchdarkly-server-sdk", path: "."
+  # Inline gemfiles don't appear to load the gemspec so we are loading it explicitly
+  gemspec 
 end
 
 Bundler.require(:development)