util: fix instanceof checks with null prototypes during inspection

Signed-off-by: Ruben Bridgewater <ruben@bridgewater.de>

Fixes: https://github.com/nodejs/node/issues/35730

PR-URL: https://github.com/nodejs/node/pull/36178
Fixes: https://github.com/nodejs/node/issues/36151
Refs: https://github.com/nodejs/node/pull/35754


Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>