Log Message:
libgit2: update to 1.7.1.

1.7.1

Bug fixes

    proxy: Return an error for invalid proxy URLs instead of crashing. by @lrm29 \ 
in #6597
    ssh: fix known_hosts leak in _git_ssh_setup_conn by @steven9724 in #6599
    repository: make cleanup safe for re-use with grafts by @carlosmn in #6600
    fix: Add missing include for oidarray. by @dvzrv in #6608
    Revert "CMake: Search for ssh2 instead of libssh2." by @ethomson \ 
in #6619

Compatibility improvements

    stransport: macOS: replace errSSLNetworkTimeout, with hard-coded value by \ 
@mascguy in #6610

1.7.0

This is release v1.7.0, "Kleine Raupe Nimmersatt". This release
adds shallow clone support, completes the experimental SHA256
support, adds Schannel support for Windows, and includes many other
new features and bugfixes.