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)

diff --git a/pyca-cryptography b/pyca-cryptography
index 277ee0d58c6c8cfc9517df35c8a020bea33bddf4..c18d0567386414efa3caef7ed586c4ca75bf3a8b 160000 (submodule)
--- a/pyca-cryptography
+++ b/pyca-cryptography
@@ -1 +1 @@
-Subproject commit 277ee0d58c6c8cfc9517df35c8a020bea33bddf4
+Subproject commit c18d0567386414efa3caef7ed586c4ca75bf3a8b