Update libgit2 dependency

Brings in a few CVE fixes and such for libgit2, bringing libgit to
0.99.0

Cargo.toml

@@ -34,8 +34,8 @@ anyhow = "1.0"
 filetime = "0.2"
 flate2 = { version = "1.0.3", features = ["zlib"] }
 fs2 = "0.4"
-git2 = "0.11.0"
-git2-curl = "0.12.0"
+git2 = "0.12.0"
+git2-curl = "0.13.0"
 glob = "0.3.0"
 hex = "0.4"
 home = "0.5"
@@ -46,7 +46,7 @@ jobserver = "0.1.21"
 lazycell = "1.2.0"
 libc = "0.2"
 log = "0.4.6"
-libgit2-sys = "0.10.0"
+libgit2-sys = "0.11.0"
 memchr = "2.1.3"
 num_cpus = "1.0"
 opener = "0.4"

crates/cargo-test-support/Cargo.toml

@@ -12,7 +12,7 @@ cargo = { path = "../.." }
 cargo-test-macro = { path = "../cargo-test-macro" }
 filetime = "0.2"
 flate2 = "1.0"
-git2 = "0.11"
+git2 = "0.12"
 glob = "0.3"
 lazy_static = "1.0"
 remove_dir_all = "0.5"