refactor: Change command to obtain latest tag

We now use `git tag -l --sort=-committerdate`
instead of `git describe --tags --abbrev=0`.

In CI, in order to use `griffe check`,
we usually do not fetch the whole history.
Instead, we fetch HEAD and all tags, sparsely.
With a sparse history, `git describe` fails,
whereas `git tag` works.

This will improve support in CI.

src/griffe/git.py

@@ -48,10 +48,11 @@ def _get_latest_tag(path: str | Path) -> str:
     if not path.is_dir():
         path = path.parent
     output = subprocess.check_output(
-        ["git", "describe", "--tags", "--abbrev=0"],
+        ["git", "tag", "-l", "--sort=-committerdate"],
         cwd=path,
+        text=True,
     )
-    return output.decode().strip()
+    return output.strip().split("\n", 1)[0]
 
 
 def _get_repo_root(path: str | Path) -> str: