Merge branch 'kerrizor/add-missing-feature_category-declaration' into 'master'

Add missing feature_category declaration

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/183223



Merged-by: Kerri Miller <kerrizor@kerrizor.com>
Approved-by: Nikola Milojevic <nmilojevic@gitlab.com>

spec/lib/gitlab/git/diff_stats_collection_spec.rb

@@ -2,7 +2,7 @@
 
 require "spec_helper"
 
-RSpec.describe Gitlab::Git::DiffStatsCollection do
+RSpec.describe Gitlab::Git::DiffStatsCollection, feature_category: :source_code_management do
   let(:stats_a) do
     Gitaly::DiffStats.new(additions: 10, deletions: 15, path: 'foo')
   end