switched back to which for posix sh

yum-install-packages.sh

@@ -49,7 +49,7 @@ SUDO=""
 
 if [ -n "${NO_FAIL:-}" ]; then
     # shellcheck disable=SC2230
-    if type -P dnf >/dev/null 2>&1; then
+    if which dnf >/dev/null 2>&1; then
         # dnf exists if any of the packages aren't found
         for package in $packages; do
             rpm -q "$package" || $SUDO yum install -y "$package" || :