test(auto_source): update cache-control header expectation in response test

Adjusted the expected value of the cache-control header in the response test to include 'no-cache' and 'no-store'. This change ensures that the test accurately reflects the intended caching behavior for responses, improving reliability and correctness.

Author: gildesmarais

spec/routes/auto_source_spec.rb

@@ -77,7 +77,7 @@ def app = described_class
       it 'responds successfully', :aggregate_failures do
         expect(response).to be_ok
         expect(response.body).to start_with '<?xml version="1.0" encoding="UTF-8"?>'
-        expect(response.get_header('cache-control')).to eq 'must-revalidate, private, max-age=0'
+        expect(response.get_header('cache-control')).to eq 'must-revalidate, no-cache, no-store, private, max-age=0'
         expect(response.get_header('content-type')).to eq described_class::CONTENT_TYPE_RSS
       end
     end