fix issue dealing with submodules in repositories

[Byron]

With the merge of #5416, which made it into the latest release somehow, there was also the introduction of a more convenient API for writing trees. This API, however, also added validation for everything that was about to be written to ensure the tree-entry names are valid and the objects they point to exist.

Unfortunately, a test for submodules was missing, whose objects never exist in the parent repository as they refer to the HEAD commit in the submodule.
This object-exists check would cause errors like The object d12a68fc4930062c0bed26447a6b5245697e77c1 (160000) at 'suite' could not be found.

As this runs as part of most merges now, this also means that no repository with submodules will work.

This PR updates gitoxide to the latest version which implements a test and fix.

It's definitely recommended to release an update soon after.

Fixes #5459 .

Tasks

• update gitoxide to latest version on main

[vercel]

@Byron is attempting to deploy a commit to the GitButler Team on Vercel.

A member of the Team first needs to authorize it.

[krlvi]

Thank you so much for the quick turnaround here!

[Byron]

Of course, I am glad I caught it early as well.

For posterity, here is the fix:

commit 4079519e7e292ee193248e3acea6587788c6b884
Author: Sebastian Thiel <[email protected]>
Date:   Wed Nov 6 09:07:12 2024 +0100

    fix: assure submodules are skipped everywhere
    
    This also adds `Repository::head_tree()` for convenience.

diff --git a/gix/src/object/tree/editor.rs b/gix/src/object/tree/editor.rs
index d7a42fcd9..48fd57167 100644
--- a/gix/src/object/tree/editor.rs
+++ b/gix/src/object/tree/editor.rs
@@ -263,7 +263,7 @@ fn write_cursor<'repo>(cursor: &mut Cursor<'_, 'repo>) -> Result<Id<'repo>, writ
                     id: entry.oid,
                     source: err,
                 })?;
-                if !cursor.repo.has_object(entry.oid) {
+                if !entry.mode.is_commit() && !cursor.repo.has_object(entry.oid) {
                     return Err(write::Error::MissingObject {
                         filename: entry.filename.clone(),
                         kind: entry.mode.into(),

A small oversight with huge impact.