Add testdata folders to test workflow paths filter

The tests should run on any change to the test data.

Author: per1234

.github/workflows/test-go.yml

@@ -8,13 +8,15 @@ on:
       - "go.mod"
       - "go.sum"
       - "Taskfile.yml"
+      - "**/testdata/**"
       - "**.go"
   pull_request:
     paths:
       - ".github/workflows/test-go.yml"
       - "go.mod"
       - "go.sum"
       - "Taskfile.yml"
+      - "**/testdata/**"
       - "**.go"
   workflow_dispatch:
   repository_dispatch: