fix(git): upgrade gitoxide to v0.21 (starship#4277)

* upgrade `gitoxide` to v0.21

This release comes with lenient configuration handling by default,
allowing to open repositories even their configuration values are
invalid (even for git), as long as there are viable defaults.

Furthermore this release adds the ability to open submodule repsitories.

Fixes starship#4266 and
fixes starship#4272

* Assure an object cache is set to speed up `commit.describe()`

Related to starship#4275 bringing
performance to spitting distance compared to git.

Author: Byron

Cargo.lock

@@ -44,7 +44,7 @@ dunce = "1.0.2"
 gethostname = "0.2.3"
 # Addresses https://github.com/starship/starship/issues/4251
 git-features = { version = "0.22.1", features = ["fs-walkdir-single-threaded"] }
-git-repository = "0.20.0"
+git-repository = "0.21.0"
 indexmap = { version = "1.9.1", features = ["serde"] }
 local_ipaddress = "0.1.3"
 log = { version = "0.4.16", features = ["std"] }

Cargo.toml

@@ -51,7 +51,9 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
 }
 
 fn git_tag(repo: &Repo) -> Option<String> {
-    let git_repo = repo.open();
+    // allow environment variables like GITOXIDE_OBJECT_CACHE_MEMORY and GITOXIDE_DISABLE_PACK_CACHE to speed up operation for some repos
+    let mut git_repo = repo.open().apply_environment();
+    git_repo.object_cache_size_if_unset(4 * 1024 * 1024);
     let head_commit = git_repo.head_commit().ok()?;
 
     let describe_platform = head_commit.describe().names(AnnotatedTags);