Fix toml imports

Add a compat layer for using tomllib from STL
which allows us to drop vendored toml library.

pipenv/project.py

@@ -13,6 +13,13 @@ import urllib.parse
 from json.decoder import JSONDecodeError
 from pathlib import Path
 
+import click, tomlkit
+
+try:
+    import tomllib as toml
+except ImportError:
+    import tomli as toml
+
 from pipenv.cmdparse import Script
 from pipenv.environment import Environment
 from pipenv.environments import Setting, is_in_virtualenv, normalize_pipfile_path
@@ -40,7 +47,7 @@ from pipenv.utils.shell import (
     system_which,
 )
 from pipenv.utils.toml import cleanup_toml, convert_toml_outline_tables
-from pipenv.vendor import click, plette, toml, tomlkit
+from pipenv.vendor import plette
 from pipenv.vendor.requirementslib.models.utils import get_default_pyproject_backend
 
 try:

pipenv/utils/environment.py

@@ -1,7 +1,8 @@
 import os
+import dotenv
+import click
 
 from pipenv import environments
-from pipenv.vendor import click, dotenv
 
 
 def load_dot_env(project, as_dict=False, quiet=False):

pipenv/utils/toml.py

@@ -1,4 +1,9 @@
-from pipenv.vendor import toml, tomlkit
+try:
+    import tomllib as toml
+except ImportError:
+    import tomli as toml
+
+import tomlkit
 
 
 def cleanup_toml(tml):

pipenv/vendor/dparse/parser.py

@@ -10,6 +10,11 @@ from io import StringIO
 from configparser import ConfigParser, NoOptionError
 from pathlib import PurePath
 
+try:
+    import tomllib as toml
+except ImportError:
+    import tomli as toml
+
 from .errors import MalformedDependencyFileError
 from .regex import HASH_REGEX
 
@@ -17,7 +22,6 @@ from .dependencies import DependencyFile, Dependency
 from pipenv.patched.pip._vendor.packaging.requirements import Requirement as PackagingRequirement,\
     InvalidRequirement
 from . import filetypes
-import pipenv.vendor.toml as toml
 from pipenv.patched.pip._vendor.packaging.specifiers import SpecifierSet
 from pipenv.patched.pip._vendor.packaging.version import Version, InvalidVersion
 import json

pipenv/vendor/dparse/updater.py

@@ -3,9 +3,13 @@ from __future__ import absolute_import, print_function, unicode_literals
 import re
 import json
 import tempfile
-import pipenv.vendor.toml as toml
 import os
 
+try:
+    import tomllib as toml
+except ImportError:
+    import tomli as toml
+
 
 class RequirementsTXTUpdater(object):
     SUB_REGEX = r"^{}(?=\s*\r?\n?$)"