Update Rust crate git2 to v0.20.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
git2	dependencies	patch	=0.20.0 -> =0.20.1

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Release Notes

rust-lang/git2-rs (git2)

v0.20.1

Compare Source

0.20.0...0.20.1

Added

• Added Repository::branch_upstream_merge()
  #​1131
• Added Index::conflict_get()
  #​1134
• Added Index::conflict_remove()
  #​1133
• Added opts::set_cache_object_limit()
  #​1118
• Added Repo::merge_file_from_index() and associated MergeFileOptions and MergeFileResult.
  #​1062

Changed

• The url dependency minimum raised to 2.5.4
  #​1128
• Changed the tracing callback to abort the process if the callback panics instead of randomly detecting the panic in some other function.
  #​1121
• Credential helper config (loaded with CredentialHelper::config) now checks for helpers that start with something that looks like an absolute path, rather than checking for a / or \ anywhere in the helper string (which resolves an issue if the helper had arguments with / or \).
  #​1137

Fixed

• Fixed panic in Remote::url_bytes if the url is empty.
  #​1120
• Fixed incorrect lifetimes on Patch::delta, Patch::hunk, and Patch::line_in_hunk. The return values must not outlive the Patch.
  #​1141
• Bumped requirement to libgit2-sys 0.18.1, which fixes linking of advapi32 on Windows.
  #​1143

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