Use the modern tomllib/tomli backends for reading TOML

Replace the deprecated `toml` package with the built-in `tomllib`
module in Python 3.11, with fallback to the modern `tomli` package
in older Python versions.

pytest_pylint/plugin.py

@@ -4,20 +4,25 @@
 """
 
 
+import sys
 from collections import defaultdict
 from configparser import ConfigParser, NoOptionError, NoSectionError
 from os import getcwd, makedirs, sep
 from os.path import dirname, exists, getmtime, join
 from pathlib import Path
 
 import pytest
-import toml
 from pylint import config as pylint_config
 from pylint import lint
 
 from .pylint_util import ProgrammaticReporter
 from .util import PyLintException, get_rel_path, should_include_file
 
+if sys.version_info >= (3, 11):
+    import tomllib
+else:
+    import tomli as tomllib
+
 HISTKEY = "pylint/mtimes"
 PYLINT_CONFIG_CACHE_KEY = "pylintrc"
 FILL_CHARS = 80
@@ -184,10 +189,10 @@ def _load_rc_file(self, pylintrc_file):
             pass
 
     def _load_pyproject_toml(self, pylintrc_file):
-        with open(pylintrc_file, "r", encoding="utf-8") as f_p:
+        with open(pylintrc_file, "rb") as f_p:
             try:
-                content = toml.load(f_p)
-            except (TypeError, toml.decoder.TomlDecodeError):
+                content = tomllib.load(f_p)
+            except (TypeError, tomllib.TOMLDecodeError):
                 return
 
         try:

setup.py

@@ -23,7 +23,11 @@
     packages=["pytest_pylint"],
     entry_points={"pytest11": ["pylint = pytest_pylint.plugin"]},
     python_requires=">=3.7",
-    install_requires=["pytest>=5.4", "pylint>=2.3.0", "toml>=0.7.1"],
+    install_requires=[
+        "pytest>=5.4",
+        "pylint>=2.3.0",
+        "tomli>=1.1.0; python_version < '3.11'",
+    ],
     setup_requires=["pytest-runner"],
     tests_require=["coverage", "flake8", "black", "isort"],
     classifiers=[