Maintenance: Add support for Python 3.12

The `pkg_resources` module became deprecated. `importlib.metadata` is
the right choice now to inquire package versions.

However, it is only there starting with Python 3.8. For Python 3.7,
there is the `importlib-metadata` backport package on PyPI.

cr8/__init__.py

@@ -1,3 +1,9 @@
-import pkg_resources
+try:
+    from importlib.metadata import PackageNotFoundError, version
+except ModuleNotFoundError:  # pragma:nocover
+    from importlib_metadata import PackageNotFoundError, version
 
-__version__ = pkg_resources.require('cr8')[0].version
+try:
+    __version__ = version("cr8")
+except PackageNotFoundError:  # pragma: no cover
+    __version__ = "unknown"

setup.py

@@ -29,7 +29,8 @@
         'Faker>=4.0,<5.0',
         'aiohttp>=3.3,<4',
         'toml;python_version<"3.11"',
-        'asyncpg'
+        'asyncpg',
+        'importlib-metadata;python_version<"3.8"',
     ],
     extras_require={
         'extra': ['uvloop', 'pysimdjson']
@@ -44,6 +45,7 @@
         'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
+        'Programming Language :: Python :: 3.12',
     ],
     use_scm_version=True,
     setup_requires=['setuptools_scm']