gemspec: remove redundant url

Author: bastelfreak

puppet-lint-lookup_in_parameter-check.gemspec

@@ -11,7 +11,6 @@ Gem::Specification.new do |spec|
   spec.license       = 'MIT'
 
   spec.metadata['homepage_uri'] = spec.homepage
-  spec.metadata['source_code_uri'] = spec.homepage
   spec.metadata['changelog_uri'] = "#{spec.homepage}/blob/main/CHANGELOG.md"
 
   # Specify which files should be added to the gem when it is released.