python: ttfautohint: Python 3.12 support

Since python 3.12, pkg_resources has been moved to setuptools. Also, it is deprecated.

- Kozea/Radicale#1184
- mu-editor/mu#2485
- python/cpython#95299

Signed-off-by: Shohei Maruyama <cheat.sc.linux@outlook.com>

src/python/ttfautohint/_version.py

@@ -1,11 +1,3 @@
-try:
-    from pkg_resources import get_distribution, DistributionNotFound
-    __version__ = get_distribution("ttfautohint-py").version
-except (ImportError, DistributionNotFound):
-    # either pkg_resources is missing or package is not installed
-    import warnings
-    warnings.warn(
-        "'ttfautohint-py' is missing the required distribution metadata. "
-        "Please make sure it was installed correctly.", UserWarning,
-        stacklevel=2)
-    __version__ = "0.0.0"
+from importlib import metadata
+
+__version__ = metadata.version("ttfautohint-py")