Remove vistir.compat.ResourceWarning

Built-in since Python3.

pipenv/core.py

@@ -1950,7 +1950,7 @@ def do_install(
     requirements_directory = vistir.path.create_tracked_tempdir(
         suffix="-requirements", prefix="pipenv-"
     )
-    warnings.filterwarnings("default", category=vistir.compat.ResourceWarning)
+    warnings.filterwarnings("default", category=ResourceWarning)
     if selective_upgrade:
         keep_outdated = True
     packages = packages if packages else []

pipenv/utils/shell.py

@@ -12,7 +12,6 @@ from functools import lru_cache
 from pathlib import Path
 
 from pipenv import environments
-from pipenv.vendor.vistir.compat import ResourceWarning
 
 from .constants import SCHEME_LIST
 from .processes import subprocess_run