Fix dependencies

[RoxGamba]

Fix pycbc and numpy>2 compatibility issue

This pull request introduces compatibility fixes for numpy 2.x, improves developer experience, and cleans up legacy code. The main changes include a new patch script for pycbc, updates to installation instructions and workflow, and removal of deprecated Python 2 namespace declarations.

Numpy 2.x compatibility and pycbc patching:

• Added scripts/patch_pycbc_numpy2.py to patch pycbc for numpy 2.x incompatibilities, specifically in events/threshold_cpu.py and filter/matchedfilter.py. The patch is safe to re-run and ensures pycbc works with numpy 2.x.
• Updated .github/workflows/tests.yml to apply the numpy 2.x compatibility patch after dependencies are installed.
• Modified README.md to instruct users to run the patch script after installing, and clarified its purpose and safety.
• Enhanced setup.py to print a clear post-install notice reminding users to run the patch script, both for install and develop commands. [1] [2]

Python version and packaging improvements:

• Updated setup.cfg to declare support for Python 3.12 and restrict installation to Python versions <3.13, preventing accidental installation on unsupported versions. [1] [2]

Code cleanup and modernization:

• Removed deprecated Python 2 namespace declarations and from __future__ import absolute_import from all __init__.py files in the PyART package, simplifying the codebase for modern Python. [1] [2]

Example and test improvements:

• Updated examples/match_sxs.py to set up logging and improve the loading of SXS data, including additional parameters for robustness and clarity. [1] [2]
• Added a new parameter r_ext in tests/test_gra.py for waveform initialization, improving test coverage.

Minor fixes:

• Corrected a comment in PyART/utils/convert_sxs_to_lvc.py for clarity.

Partly related to #52

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)