v2.4.0

• Dropped support for Python 3.9 and PyPy 3.10 (#250).
• Added support for Python 3.14 and PyPy 3.11 (#241, #245).
• Improved performance of headers_raw_to_dict and headers_dict_to_raw (#246).
• Switched the build system to hatchling (#243).
• The obsolete sphinx-hoverxref extension is no longer used to build the docs (#244).
• Tests and CI improvements (#237, #238, #240, #242, #248, #251).