tls: fix malloc mismatch in SSL_set_tlsext_status_ocsp_resp call

SSL_set_tlsext_status_ocsp_resp expects the data to be allocated with
OPENSSL_malloc, not libc malloc, so use OpenSSLMalloc.

Additionally, though OpenSSL doesn't type-check due to it being a macro,
the function is documented to take an unsigned char pointer:
https://www.openssl.org/docs/man1.1.0/ssl/SSL_set_tlsext_status_ocsp_resp.html

(By default, OPENSSL_malloc is the same as libc malloc, but it is
possible to customize this.)

PR-URL: https://github.com/nodejs/node/pull/25706


Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>