Resolve indirect references in Repository.references

`bark setup` failed for me:

```
$ poetry run -- bark -l debug setup
INFO 19:15:31.709 [gitbark.logging.set_log_level:18] Logging at level: DEBUG
ERROR 19:15:31.728 [gitbark.cli.__main__.main:333] An unexpected error occured.
Traceback (most recent call last):
  File "/home/emlun/dev/gitbark/gitbark/cli/__main__.py", line 324, in main
    cli(obj={})
  File "/home/emlun/.cache/pypoetry/virtualenvs/gitbark-X6l5axH9-py3.11/lib/python3.11/site-packages/click/core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/emlun/.cache/pypoetry/virtualenvs/gitbark-X6l5axH9-py3.11/lib/python3.11/site-packages/click/core.py", line 1055, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "/home/emlun/.cache/pypoetry/virtualenvs/gitbark-X6l5axH9-py3.11/lib/python3.11/site-packages/click/core.py", line 1657, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/emlun/.cache/pypoetry/virtualenvs/gitbark-X6l5axH9-py3.11/lib/python3.11/site-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/emlun/.cache/pypoetry/virtualenvs/gitbark-X6l5axH9-py3.11/lib/python3.11/site-packages/click/core.py", line 760, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/emlun/.cache/pypoetry/virtualenvs/gitbark-X6l5axH9-py3.11/lib/python3.11/site-packages/click/decorators.py", line 26, in new_func
    return f(get_current_context(), *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/emlun/dev/gitbark/gitbark/cli/__main__.py", line 120, in setup
    setup_cmd(project)
  File "/home/emlun/dev/gitbark/gitbark/commands/setup.py", line 304, in setup
    if not has_valid_bark_rules(project):
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/emlun/dev/gitbark/gitbark/commands/setup.py", line 119, in has_valid_bark_rules
    if BARK_RULES_REF in project.repo.references:
                         ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/emlun/dev/gitbark/gitbark/git.py", line 201, in references
    return {
           ^
  File "/home/emlun/dev/gitbark/gitbark/git.py", line 202, in <dictcomp>
    ref.name: Commit(ref.target.raw, self)
                     ^^^^^^^^^^^^^^
AttributeError: 'str' object has no attribute 'raw'
```

Adding some debug output to `Repository.references()`...

```python
for ref in self._object.references.iterator():
    print(ref.name, ref.target, ref.resolve(), ref.resolve().target)
```

...reveals that this is because `refs/remotes/origin/HEAD` has a `target` of
`refs/remotes/origin/main` rather than a raw commit ID:

```
$ poetry run -- bark -l debug setup
INFO 19:12:22.585 [gitbark.logging.set_log_level:18] Logging at level: DEBUG
refs/heads/main 0c53530 <_pygit2.Reference object at 0x7ba5900ef010> 0c53530
refs/remotes/origin/HEAD refs/remotes/origin/main <_pygit2.Reference object at 0x7ba5900ef9d0> 0c53530
refs/remotes/origin/main 0c53530 <_pygit2.Reference object at 0x7ba5900ef010> 0c53530
refs/remotes/origin/performance edf3f29 <_pygit2.Reference object at 0x7ba5900ef9d0> edf3f29
refs/remotes/origin/refactor fe51b90 <_pygit2.Reference object at 0x7ba5900ef010> fe51b90
refs/remotes/origin/refactor-2 31c5b1a <_pygit2.Reference object at 0x7ba5900ef9d0> 31c5b1a
refs/remotes/origin/test-ssh 5a9baa5 <_pygit2.Reference object at 0x7ba5900ef010> 5a9baa5
refs/remotes/origin/tests 4250bfa <_pygit2.Reference object at 0x7ba5900ef9d0> 4250bfa
refs/remotes/origin/verify_from_bootstrap e864e3e <_pygit2.Reference object at 0x7ba5900ef010> e864e3e
```

gitbark/git.py

@@ -199,7 +199,7 @@ def branch(self) -> Optional[str]:
     @property
     def references(self) -> dict[str, Commit]:
         return {
-            ref.name: Commit(ref.target.raw, self)
+            ref.name: Commit(ref.resolve().target.raw, self)
             for ref in self._object.references.iterator()
         }