chore: Upgrade git2

Author: epage

Cargo.lock

@@ -133,7 +133,7 @@ cargo_metadata = "0.18"
 # present, and then to let the user _select_ through configuration which
 # one they want to be used.
 tame-index = { version = "0.13", features = ["sparse", "native-certs"] }
-git2 = { version = "0.18.3", default-features = false }
+git2 = { version = "0.19.0", default-features = false }
 toml_edit = { version = "0.22.12", features = ["serde"] }
 toml = "0.8.12"
 serde = { version = "1.0", features = ["derive"] }
@@ -165,8 +165,8 @@ anstyle = "1.0.7"
 assert_fs = "1.1"
 predicates = "3.1"
 snapbox = "0.6.16"
-cargo-test-macro = "0.2.1"
-cargo-test-support = "0.2.1"
+cargo-test-macro = "0.3"
+cargo-test-support = "0.3"
 
 [profile.release]
 panic = "abort"