test: remove sha from test expectations

"sha" in OpenSSL refers to SHA-0 which was removed from OpenSSL 1.1.0
and is insecure. Replace it with SHA-256 which is present in both 1.0.2
and 1.1.0. Short of shipping a reimplementation in Node, this is an
unavoidable behavior change with 1.1.0.

PR-URL: https://github.com/nodejs/node/pull/16130


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Rod Vagg <rod@vagg.org>