Remove verbose for prove xt in CI

Author: thibaultduponchelle

.github/workflows/test.yml

@@ -26,4 +26,4 @@ jobs:
       run: prove -lr t/
 
     - name: Run author tests
-      run: mv Makefile.PL.bak Makefile.PL && prove -lv xt/
+      run: mv Makefile.PL.bak Makefile.PL && prove -l xt/