Update git2-curl requirement from 0.8.1 to 0.9.0

Updates the requirements on [git2-curl](https://github.com/alexcrichton/git2-rs) to permit the latest version.
- [Release notes](https://github.com/alexcrichton/git2-rs/releases)
- [Commits](https://github.com/alexcrichton/git2-rs/commits)

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

Cargo.toml

@@ -32,7 +32,7 @@ filetime = "0.2"
 flate2 = { version = "1.0.3", features = ['zlib'] }
 fs2 = "0.4"
 git2 = "0.7.5"
-git2-curl = "0.8.1"
+git2-curl = "0.9.0"
 glob = "0.2.11"
 hex = "0.3"
 home = "0.3"