Avoiding directory execution on hook (#10954) (#10955)

* test -x is not enough https://stackoverflow.com/a/39489087

integrations/gitea-repositories-meta/user2/repo20.git/hooks/update

@@ -4,7 +4,7 @@ hookname=$(basename $0)
 GIT_DIR=${GIT_DIR:-$(dirname $0)}
 
 for hook in ${GIT_DIR}/hooks/${hookname}.d/*; do
-test -x "${hook}" || continue
+test -x "${hook}" && test -f "${hook}" || continue
 "${hook}" $1 $2 $3
 exitcodes="${exitcodes} $?"
 done