fix(deps): update rust crate git2 to 0.18

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
git2	dependencies	minor	0.17 -> 0.18

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Release Notes

rust-lang/git2-rs (git2)

v0.18.0

Compare Source

0.17.2...0.18.0

Added

• Added Blame::blame_buffer for getting blame data for a file that has been modified in memory.
  #​981

Changed

• Updated to libgit2 1.7.0.
  #​968
• Updated to libgit2 1.7.1.
  #​982
• Switched from bitflags 1.x to 2.1. This brings some small changes to types generated by bitflags.
  #​973
• Changed Revwalk::with_hide_callback to take a mutable reference to its callback to enforce type safety.
  #​970
• Implemented FusedIterator for many iterators that can support it.
  #​955

Fixed

• Fixed builds with cargo's -Zminimal-versions.
  #​960

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