deps: update setuptools_scm, switch to tomli

Author: davidhewitt

setup.cfg

@@ -26,8 +26,8 @@ classifiers =
 [options]
 packages = setuptools_rust
 zip_safe = True
-install_requires = setuptools>=46.1; semantic_version>=2.6.0; toml>=0.9.0; typing_extensions>=3.7.4.3
-setup_requires = setuptools>=46.1; setuptools_scm[toml]>=3.4.3
+install_requires = setuptools>=46.1; semantic_version>=2.6.0; tomli>=1.2.1; typing_extensions>=3.7.4.3
+setup_requires = setuptools>=46.1; setuptools_scm>=6.3.2
 python_requires = >=3.6
 
 [options.entry_points]

setuptools_rust/extension.py

@@ -5,6 +5,7 @@
 from typing import Dict, List, Optional, Union
 
 import semantic_version
+import tomli
 from typing_extensions import Literal
 
 
@@ -145,10 +146,8 @@ def __init__(
 
     def get_lib_name(self):
         """Parse Cargo.toml to get the name of the shared library."""
-        # We import in here to make sure the the setup_requires are already installed
-        import toml
-
-        cfg = toml.load(self.path)
+        with open(self.path, "rb") as f:
+            cfg = tomli.load(f)
         name = cfg.get("lib", {}).get("name")
         if name is None:
             name = cfg.get("package", {}).get("name")