Update pyca-cryptography submodule to 38.0.4
Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19681)
(cherry picked from commit d656efb9eb7692c0b1cba843d7787751e388cc8a)