Update dependency pyopenssl to v19.1.0

This MR contains the following updates:

Package	Update	Change
pyopenssl (source)	minor	==19.0.0 -> ==19.1.0

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Release Notes

pyca/pyopenssl

v19.1.0

Compare Source

Backward-incompatible changes: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

• Removed deprecated ContextType, ConnectionType, PKeyType, X509NameType, X509ReqType, X509Type, X509StoreType, CRLType, PKCS7Type, PKCS12Type, and NetscapeSPKIType aliases. Use the classes without the Type suffix instead. #&#8203;814 <https://github.com/pyca/pyopenssl/pull/814>_
• The minimum cryptography version is now 2.8 due to issues on macOS with a transitive dependency. #&#8203;875 <https://github.com/pyca/pyopenssl/pull/875>_

Deprecations: ^^^^^^^^^^^^^

• Deprecated OpenSSL.SSL.Context.set_npn_advertise_callback, OpenSSL.SSL.Context.set_npn_select_callback, and OpenSSL.SSL.Connection.get_next_proto_negotiated. ALPN should be used instead. #&#8203;820 <https://github.com/pyca/pyopenssl/pull/820>_

Changes: ^^^^^^^^

• Support bytearray in SSL.Connection.send() by using cffi's from_buffer. #&#8203;852 <https://github.com/pyca/pyopenssl/pull/852>_
• The OpenSSL.SSL.Context.set_alpn_select_callback can return a new NO_OVERLAPPING_MROTOCOLS sentinel value to allow a TLS handshake to complete without an application protocol.

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