python3: ignore CVE-2023-36632

This CVE shouldn't have been filed as the "exploit" is described in the
documentation as how the library behaves.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>