distutils removed in python 3.12

importmagic 0.1.7 uses distutils.sysconfig to find some library paths and unfortunately distutils was removed in Python 3.12.

This was my stab at replacing it. After glancing at I'm not sure what the difference is between prefix=None and sys.prefix is.

On my system the calculated prefix (from prefix=None) always ends up the same as sys.prefix

```
--- a/importmagic/index.py
+++ b/importmagic/index.py
@@ -8,18 +8,16 @@
import logging
import re
from contextlib import contextmanager
-from distutils import sysconfig
+import sysconfig

from importmagic.util import parse_ast


LIB_LOCATIONS = sorted(set((
- (sysconfig.get_python_lib(standard_lib=True), 'S'),
- (sysconfig.get_python_lib(plat_specific=True), '3'),
- (sysconfig.get_python_lib(standard_lib=True, prefix=sys.prefix), 'S'),
- (sysconfig.get_python_lib(plat_specific=True, prefix=sys.prefix), '3'),
- (sysconfig.get_python_lib(standard_lib=True, prefix='/usr/local'), 'S'),
- (sysconfig.get_python_lib(plat_specific=True, prefix='/usr/local'), '3'),
+ (sysconfig.get_path('stdlib', scheme='deb_system'), 'S'),
+ (sysconfig.get_path('platlib', scheme='deb_system'), '3'),
+ (sysconfig.get_path('stdlib', scheme='posix_local'), 'S'),
+ (sysconfig.get_path('platlib', scheme='posix_local'), '3'),
)), key=lambda l: -len(l[0]))

# Regex matching modules that we never attempt to index.

```