build(deps): bump git2 from 0.19.0 to 0.20.0

Bumps [git2](https://github.com/rust-lang/git2-rs) from 0.19.0 to 0.20.0.
- [Changelog](https://github.com/rust-lang/git2-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/git2-rs/compare/git2-0.19.0...git2-0.20.0)

---
updated-dependencies:
- dependency-name: git2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.lock

@@ -520,9 +520,9 @@ checksum = "07e28edb80900c19c28f1072f2e8aeca7fa06b23cd4169cefe1af5aa3260783f"
 
 [[package]]
 name = "git2"
-version = "0.19.0"
+version = "0.20.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b903b73e45dc0c6c596f2d37eccece7c1c8bb6e4407b001096387c63d0d93724"
+checksum = "3fda788993cc341f69012feba8bf45c0ba4f3291fcc08e214b4d5a7332d88aff"
 dependencies = [
  "bitflags",
  "libc",
@@ -807,9 +807,9 @@ checksum = "b5aba8db14291edd000dfcc4d620c7ebfb122c613afb886ca8803fa4e128a20a"
 
 [[package]]
 name = "libgit2-sys"
-version = "0.17.0+1.8.1"
+version = "0.18.0+1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "10472326a8a6477c3c20a64547b0059e4b0d086869eee31e6d7da728a8eb7224"
+checksum = "e1a117465e7e1597e8febea8bb0c410f1c7fb93b1e1cddf34363f8390367ffec"
 dependencies = [
  "cc",
  "libc",

Cargo.toml

@@ -114,7 +114,7 @@ serde_norway = "0.9"
 backtrace = "0.3"
 
 [dependencies.git2]
-version = "0.19"
+version = "0.20"
 optional = true
 default-features = false