fix: replace pkg_resources with importlib.resources for Python 3.14 compat

[kusold]

Summary

• Replace pkg_resources with importlib.resources in shreddit/app.py, fixing ModuleNotFoundError: No module named 'pkg_resources' on Python 3.14
• Remove setuptools from dependencies since it's no longer needed
• Bump version to 6.4.2

Context

The Docker image (python:3.14-alpine) doesn't include setuptools by default, and pkg_resources was removed from the stdlib in Python 3.14. This caused shreddit to crash on every invocation.

Test plan

• Verify docker build . succeeds
• Verify shreddit -g generates config files correctly
• Verify normal shreddit invocation works against Reddit API

[github-actions]

❌ Commit Message Validation Failed

Some commits in this PR don't follow the Conventional Commits specification.

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• feat: add automated security scanning
• fix: resolve Docker build issue
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• chore: update dependencies
• refactor(api): simplify error handling

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[github-actions]

🎉 This PR is included in version 6.5.0 🎉

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