Update Rust crate git2 to v0.20.3 (#12459)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Cargo.lock

@@ -20,7 +20,7 @@ anyhow = "=1.0.100"
 base64 = "=0.22.1"
 chrono = { version = "=0.4.42", features = ["serde"] }
 crates_io_env_vars = { path = "../crates_io_env_vars" }
-git2 = "=0.20.2"
+git2 = "=0.20.3"
 secrecy = "=0.10.3"
 serde = { version = "=1.0.228", features = ["derive"] }
 serde_json = "=1.0.145"