Update Rust crate git2 to 0.13.23

Author: renovate-bot

Cargo.lock

@@ -57,7 +57,7 @@ dotenv = "0.15"
 flate2 = "1.0"
 futures-channel = { version = "0.3.1", default-features = false }
 futures-util = "0.3"
-git2 = "0.13.0"
+git2 = "0.13.23"
 hex = "0.4"
 http = "0.2"
 hyper = { version = "0.14", features = ["client", "http1"] }