Auto merge of #10442 - Urgau:git2-update, r=alexcrichton

Update git2 dependencies

This pull-request update git2 to 0.14.1 and git2-curl to 0.15.0 and libgit2-sys to 0.13.1.

This fix a memory corruption that I have locally when running the testsuite:
```
==2338650==  Uninitialised value was created by a stack allocation
==2338650==    at 0x11FE3A0: git2::remote::Remote::fetch (remote.rs:276)
```

Cargo.toml

@@ -29,8 +29,8 @@ 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 = "0.13.23"
-git2-curl = "0.14.1"
+git2 = "0.14.1"
+git2-curl = "0.15.0"
 glob = "0.3.0"
 hex = "0.4"
 home = "0.5"
@@ -41,7 +41,7 @@ jobserver = "0.1.24"
 lazycell = "1.2.0"
 libc = "0.2"
 log = "0.4.6"
-libgit2-sys = "0.12.24"
+libgit2-sys = "0.13.1"
 memchr = "2.1.3"
 num_cpus = "1.0"
 opener = "0.5"

crates/cargo-test-support/Cargo.toml

@@ -13,7 +13,7 @@ cargo-test-macro = { path = "../cargo-test-macro" }
 cargo-util = { path = "../cargo-util" }
 filetime = "0.2"
 flate2 = { version = "1.0", default-features = false, features = ["zlib"] }
-git2 = "0.13.16"
+git2 = "0.14.1"
 glob = "0.3"
 itertools = "0.10.0"
 lazy_static = "1.0"