Update git2

Author: ehuss

Cargo.toml

@@ -32,7 +32,7 @@ pretty_env_logger = { version = "0.4", optional = true }
 anyhow = "1.0"
 filetime = "0.2.9"
 flate2 = { version = "1.0.3", default-features = false, features = ["zlib"] }
-git2 = "0.13.16"
+git2 = "0.13.23"
 git2-curl = "0.14.1"
 glob = "0.3.0"
 hex = "0.4"
@@ -44,7 +44,7 @@ jobserver = "0.1.24"
 lazycell = "1.2.0"
 libc = "0.2"
 log = "0.4.6"
-libgit2-sys = "0.12.18"
+libgit2-sys = "0.12.24"
 memchr = "2.1.3"
 num_cpus = "1.0"
 opener = "0.5"