(CAT-2532) Updates matrix output regex

Updates the regular expression used to validate the collection output within the matrix generation script. This ensures compatibility with various date formats in the puppet_enterprise version strings.

CAT-2532

Author: david22swan

spec/exe/matrix_from_metadata_v3_spec.rb

@@ -233,7 +233,7 @@
         '::group::spec_matrix'
       )
       expect(github_output_content).to include(
-        '"collection":["2023.8.6-puppet_enterprise","2021.7.9-puppet_enterprise","puppetcore8"'
+        /"collection":\["\d{4}\.\d\.\d-puppet_enterprise","\d{4}\.\d\.\d-puppet_enterprise","puppetcore8"/
       )
       expect(github_output_content).to include(
         'spec_matrix={"include":[{"puppet_version":"~> 8.0","ruby_version":3.2}]}'