Merge branch 'sh-bump-issauble-timeout' into 'master'

Bump Markdown timeout from 3 to 6 seconds in test

Closes #35269

See merge request gitlab-org/gitlab!19408

spec/support/shared_examples/models/concern/issuable_shared_examples.rb

@@ -4,7 +4,7 @@ shared_examples_for 'matches_cross_reference_regex? fails fast' do
   it 'fails fast for long strings' do
     # took well under 1 second in CI https://dev.gitlab.org/gitlab/gitlabhq/merge_requests/3267#note_172823
     expect do
-      Timeout.timeout(3.seconds) { mentionable.matches_cross_reference_regex? }
+      Timeout.timeout(6.seconds) { mentionable.matches_cross_reference_regex? }
     end.not_to raise_error
   end
 end