workflows/triage: add keep_if_no_match for CI-no-bottles

Omitting this will make the triage workflow remove the `CI-no-bottles`
label for PRs that do not touch the `portable-*` formulae. I don't think
we want that.

Author: carlocab

.github/workflows/triage.yml

@@ -436,6 +436,7 @@ jobs:
               path: Formula/p/portable-.+
               except:
                 - Formula/p/portable-ruby.rb
+              keep_if_no_match: true
 
             - label: bump-formula-pr
               pr_body_content: Created with `brew bump-formula-pr`