Fix #571 support py 3.12

[robnagler]

• Fix Replace pkg_resources with importlib #462 Replace pkg_resources with importlib.resources

[Copilot]

Pull Request Overview

This PR migrates from the deprecated pkg_resources module to the modern importlib.metadata and importlib.resources APIs to support Python 3.12 compatibility. The changes replace legacy package resource handling with the standard library equivalents that are recommended for newer Python versions.

• Replace pkg_resources.get_distribution().version with importlib.metadata.version()
• Replace pkg_resources.resource_filename() with importlib.resources.files()
• Update exception handling from DistributionNotFound to PackageNotFoundError

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/pkcli/projex2_data/xyzzy1.in/xyzzy1/init.py	Update test data package to use importlib.metadata for version retrieval
tests/pkcli/projex2_data/private.in/private/init.py	Update test data package to use importlib.metadata for version retrieval
pykern/pkresource.py	Replace pkg_resources.resource_filename with importlib.resources.files for resource path resolution
pykern/pkcli/test.py	Add raw string prefix to regex pattern
pykern/package_data/projex/projex/init.py.jinja	Update package template to use importlib.metadata for version retrieval