Use sequence in software_update fabricator to allow multiple (#29438)

spec/fabricators/software_update_fabricator.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 Fabricator(:software_update) do
-  version '99.99.99'
+  version { sequence(:version) { |point| "99.99.#{point}" } }
   urgent false
   type 'patch'
 end