Add support for Python 3.12 and 3.13

[Forest-Newark]

Add support for Python 3.12 and 3.13

Summary

This PR adds support for Python 3.12 and 3.13 to the CodeGuru Profiler Python agent while maintaining full backwards compatibility with Python 3.6-3.11.

Changes

Core Python 3.12/3.13 Support:

• Fixed deprecated datetime.utcfromtimestamp() usage in codeguru_profiler_agent/utils/time.py

  • Replaced with datetime.fromtimestamp(epoch, timezone.utc) to eliminate deprecation warnings in Python 3.12+
  • Maintains identical output format and backwards compatibility

• Updated memory counter test in test/unit/model/test_memory_counter.py

  • Added version-aware expectations for Python 3.12+ optimized string memory allocation (24 bytes reduction)

• Updated package metadata in setup.py

  • Added Python 3.12 and 3.13 classifiers for PyPI

• Updated CI/CD pipeline in .github/workflows/python-package.yml

  • Added Python 3.12 and 3.13 to test matrix
  • Fixed platform exclusions for EOL Python versions (3.6-3.7 on ubuntu-latest and macos-latest ARM64)

Test Fixes (Pre-existing Issues):

• Fixed sys.set_int_max_str_digits test in test/unit/metrics/test_with_timer.py

  • Changed version check to hasattr() to handle backport variations across Python 3.8.x versions

• Fixed Bandit security warning in codeguru_profiler_agent/sampler.py

  • Added # nosec B311 to suppress false positive for random.sample() (not used for cryptographic purposes)

Version bump: 1.2.5 → 1.2.6

Updated CHANGELOG.rst

Testing

• ✅ All 337 unit tests pass on Python 3.13.2
• ✅ All 336 unit tests pass on Python 3.12.12
• ✅ No deprecation warnings
• ✅ Backwards compatible with Python 3.6-3.11
• ✅ CI/CD pipeline tests all versions 3.6-3.13 across ubuntu, windows, and macos

Motivation

Python 3.12 deprecated datetime.utcfromtimestamp() which will be removed in a future version. This change ensures the agent works without warnings on Python 3.12+ and is ready for AWS Lambda Python 3.13
runtime support.