Don't run CompatHelper on test dir without Project.toml

Author: sethaxen

.github/workflows/CompatHelper.yml

@@ -13,7 +13,7 @@ jobs:
       - name: CompatHelper.main()
         run: |
           using CompatHelper
-          subdirs = ["", "test", "docs"]
+          subdirs = ["", "docs"]
           CompatHelper.main(; subdirs)
         shell: julia --color=yes {0}
         env: