chore(deps): Update Rust crate git2 to 0.18.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
git2	build-dependencies	patch	0.18.0 -> 0.18.1

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Release Notes

rust-lang/git2-rs (git2)

v0.18.1

Compare Source

0.18.0...0.18.1

Added

• Added FetchOptions::depth to set the depth of a fetch or clone, adding support for shallow clones.
  #​979

Fixed

• Fixed an internal data type (TreeWalkCbData) to not assume it is a transparent type while casting.
  #​989
• Fixed so that DiffPatchidOptions and StashSaveOptions are publicly exported allowing the corresponding APIs to actually be used.
  #​988

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