Changes to address static-analysis failures

Rubocop warning for Time.at is ignored here intentionally
because the actual call (fixed) does have Time.at.utc
pattern that the rule fired suggests.

Removed an unnecessary newline in the spec file.

spec/lib/gitlab/ci/ansi2json/line_spec.rb

@@ -76,7 +76,6 @@ RSpec.describe Gitlab::Ci::Ansi2json::Line do
   end
 
   describe '#set_section_duration' do
-
     shared_examples 'set_section_duration' do
       it 'sets and formats the section_duration' do
         subject.set_section_duration(75)
@@ -91,7 +90,13 @@ RSpec.describe Gitlab::Ci::Ansi2json::Line do
 
     context 'with a timezone carrying minutes offset' do
       before do
+        # The actual call by does use Time.at(...).utc that the following
+        # rubocop rule (Rails/TimeZone) suggests, but for this specific
+        # test's purposes we needed to mock at the Time.at call point.
+
+        # rubocop:disable Rails/TimeZone
         allow(Time).to receive(:at).with(75).and_return(Time.at(75, in: '+05:30'))
+        # rubocop:enable Rails/TimeZone
       end
 
       it_behaves_like 'set_section_duration'