Migrate from pkg_resources to packaging for version parsing.

Update build dependencies and version parsing logic in setup.py to use the `packaging` library instead of the deprecated `pkg_resources`.

PiperOrigin-RevId: 911244969

Author: tomvdw

pyproject.toml

@@ -1,4 +1,4 @@
 [build-system]
 # PEP 508 specs
-requires = ["setuptools", "wheel"]
+requires = ["setuptools", "wheel", "packaging"]
 build-backend = "setuptools.build_meta"

setup.py

@@ -29,7 +29,7 @@
 import os
 import sys
 
-import pkg_resources
+from packaging.version import Version
 import setuptools
 
 # To enable importing version.py directly, we add its path to sys.path.
@@ -40,7 +40,7 @@
 if datestring := os.environ.get('TFDS_NIGHTLY_TIMESTAMP'):
   project_name = 'tfds-nightly'
   # Version as `X.Y.Z.dev199912312459`
-  curr_version = pkg_resources.parse_version(__version__)
+  curr_version = Version(__version__)
   __version__ = f'{curr_version.base_version}.dev{datestring}'
 else:
   project_name = 'tensorflow-datasets'