vcs: use peeled ref when retrieving tag revision

This is required to support incoming changes introduced in dulwich
>=0.22.2. This change preserves current behaviour and ensures locks
do not change when dulwich is updated.

Author: abn

src/poetry/vcs/git/backend.py

@@ -176,7 +176,7 @@ def get_remote_url(repo: Repo, remote: str = "origin") -> str:
     @staticmethod
     def get_revision(repo: Repo) -> str:
         with repo:
-            return repo.head().decode("utf-8")
+            return repo.get_peeled(b"HEAD").decode("utf-8")
 
     @classmethod
     def info(cls, repo: Repo | Path) -> GitRepoLocalInfo: