CLDC-4140: update csv-parser spec

spec/services/bulk_upload/lettings/year2026/csv_parser_spec.rb

@@ -244,10 +244,10 @@ RSpec.describe BulkUpload::Lettings::Year2026::CsvParser do
       end
 
       it "returns correct column" do
-        expect(service.column_for_field("field_5")).to eql("F")
-        expect(service.column_for_field("field_22")).to eql("AW")
-        expect(service.column_for_field("field_26")).to eql("DO")
-        expect(service.column_for_field("field_25")).to eql("R")
+        expect(service.column_for_field("field_5")).to eql("B")
+        expect(service.column_for_field("field_22")).to eql("AS")
+        expect(service.column_for_field("field_26")).to eql("DG")
+        expect(service.column_for_field("field_25")).to eql("I")
       end
     end
   end