Log Message:
devel/libgit2: update to 1.5.1

1.5.1 (2023-01-20)

libgit2, when compiled using the optional, included libssh2 backend, fails
to verify SSH keys by default.

Description

When using an SSH remote with the optional, included libssh2 backend,
libgit2 does not perform certificate checking by default.  Prior versions of
libgit2 require the caller to set the certificate_check field of libgit2's
git_remote_callbacks structure - if a certificate check callback is not set,
libgit2 does not perform any certificate checking.  This means that by
default - without configuring a certificate check callback, clients will not
perform validation on the server SSH keys and may be subject to a
man-in-the-middle attack.

Beginning in libgit2 v1.4.5 and v1.5.1, libgit2 will now perform host key
checking by default.  Users can still override the default behavior using
the certificate_check function.

The libgit2 security team would like to thank the Julia and Rust security
teams for responsibly disclosing this vulnerability and assisting with
fixing the vulnerability.

Users are encouraged to upgrade to v1.4.5 or v1.5.1.