Bump git2 from 0.13.25 to 0.16.1

[dependabot[bot]]

Bumps git2 from 0.13.25 to 0.16.1.

Commits

• a233483 Update to libgit2 1.5.1
• bce1555 Merge pull request #909 from ehuss/ssh-keys
• 222fbf3 Bump versions
• fa41943 Change the certificate_check callback to support passthrough.
• 84e21aa Add ability to get the SSH host key and its type.
• e6aa666 Bump git2-curl version. (#861)
• 46674ce Fix warning about unused_must_use for Box::from_raw (#860)
• 951dce9 Merge pull request #858 from davidkna/git2150
• 8871f8e bump libgit2 to 1.5.0
• 04278a2 Merge pull request #839 from davidkna/libgit2_143
• Additional commits viewable in compare view

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