In Python 3.11 and later, use tomllib instead of toml

This removes the dependency on toml for Python versions that have
tomllib in the standard library.

Author: musicinmybrain

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools", "toml"]
+requires = ["setuptools", "toml; python_version < '3.11'"]
 
 [tool]
 [tool.poetry]
@@ -12,7 +12,7 @@ homepage = "https://github.com/gchamon/sysrsync"
 
 [tool.poetry.dependencies]
 python = "^3.6"
-toml = "^0.10.0"
+toml = { version = "^0.10.0", python = "<3.11" }
 
 [tool.poetry.dev-dependencies]
 autopep8 = "*"

setup.py

@@ -1,8 +1,12 @@
 """Setup script for sysrsync."""
 import setuptools
-import toml
+try:
+    from tomllib import load  # Python 3.11 and later
+except ImportError:
+    from toml import load  # Python 3.10 and earlier
 
-pyproject = toml.load("pyproject.toml")
+with open("pyproject.toml", "rb") as fh:
+    pyproject = load(fh)
 
 with open("README.md", "r") as fh:
     long_description = fh.read()