ci: stop using fork of donry/paths-filter, its no longer needed

.github/workflows/validate-clusters.yaml

@@ -85,9 +85,7 @@ jobs:
         # Don't run this step when we manually trigger the workflow
         if: github.event_name != 'workflow_dispatch'
         # Action repo: https://github.com/dorny/paths-filter
-        # Fork of the repo above that we use: https://github.com/frouioui/paths-filter/tree/main
-        # In order to take advantage of https://github.com/dorny/paths-filter/pull/133
-        uses: frouioui/paths-filter@main
+        uses: dorny/paths-filter@v3
         id: file_changes
         with:
           token: ""
@@ -104,7 +102,7 @@ jobs:
               - added|modified: config/clusters/**''
               # We want to ignore config/clusters/templates/** here but it may
               # not be possible for us to do so.
-              # - added|modified: !config/clusters/templates/**
+              - added|modified: !config/clusters/templates/**
 
       # Only run this step if there *ARE* changes under the common filter, *OR*
       # we have manually triggered the workflow