libssh2: use libssh2_session_callback_set2()
with v1.11.1
#12754
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To avoid a local hack to pass function pointers and to avoid
deprecation warnings when building with libssh2 v1.11.1 or newer:
Ref: https://github.com/curl/curl-for-win/actions/runs/7609484879/job/20720821100#step:3:4982
Ref: libssh2/libssh2#1285
Ref: libssh2/libssh2@c0f6954
Closes #12754