tls: do not free cert in `.getCertificate()`
The documentation of SSL_get_certificate
states that it returns
an internal pointer that must not be freed by the caller.
Therefore, using a smart pointer to take ownership is incorrect.
Refs: https://man.openbsd.org/SSL_get_certificate.3 Refs: https://github.com/nodejs/node/pull/24261
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines