Remove unused context manager (#38897)

lib/spack/spack/package_base.py

@@ -11,7 +11,6 @@
 
 import base64
 import collections
-import contextlib
 import copy
 import functools
 import glob
@@ -1785,13 +1784,6 @@ def _resource_stage(self, resource):
         resource_stage_folder = "-".join(pieces)
         return resource_stage_folder
 
-    @contextlib.contextmanager
-    def _stage_and_write_lock(self):
-        """Prefix lock nested in a stage."""
-        with self.stage:
-            with spack.store.db.prefix_write_lock(self.spec):
-                yield
-
     def do_install(self, **kwargs):
         """Called by commands to install a package and or its dependencies.