external/boringssl: Sync to 9c33ae85621ef8e00a42309b5101e0bedd02b816.

This includes the following changes:

https://boringssl.googlesource.com/boringssl/+log/629db8cd0c84628e37aa81242b5b07fec7602f55..9c33ae85621ef8e00a42309b5101e0bedd02b816

Bug: 33622440
Test: BoringSSL tests
Change-Id: I20da15ad995a620b6b2f08db20c77ebd0f05ca10
diff --git a/src/ssl/tls13_both.c b/src/ssl/tls13_both.c
index 5a058b1..7347fc4 100644
--- a/src/ssl/tls13_both.c
+++ b/src/ssl/tls13_both.c
@@ -243,7 +243,8 @@
 
     uint8_t alert;
     if (!ssl_parse_extensions(&extensions, &alert, ext_types,
-                              OPENSSL_ARRAY_SIZE(ext_types))) {
+                              OPENSSL_ARRAY_SIZE(ext_types),
+                              0 /* reject unknown */)) {
       ssl3_send_alert(ssl, SSL3_AL_FATAL, alert);
       goto err;
     }