gh-146207: Add support for OpenSSL 4.0.0 alpha1 (#146217)

OpenSSL 4.0.0 alpha1 removed these functions:

* SSLv3_method()
* TLSv1_method()
* TLSv1_1_method()
* TLSv1_2_method()

Other changes:

* Update test_openssl_version().
* Update multissltests.py for OpenSSL 4.
* Add const qualifier to fix compiler warnings.

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>