[XPACk] Fix reference to deprecation rest yaml test file

Author: estolfo

elasticsearch-xpack/spec/spec_helper.rb

@@ -90,7 +90,7 @@
 skipped_files += Dir.glob("#{YAML_FILES_DIRECTORY}/ml/set_upgrade_mode.yml")
 
 # 'Test Deprecations' has non-zero length node_settings field
-skipped_files += Dir.glob("#{YAML_FILES_DIRECTORY}/deprecations/10_basic.yml")
+skipped_files += Dir.glob("#{YAML_FILES_DIRECTORY}/deprecation/10_basic.yml")
 
 SINGLE_TEST = nil
 # Uncomment the following line and set it to a file when a single test should be run.