v4.2.0

What's Changed

• Update requirements by @bmerry in #292
• Make async_send_heap and async_send_heaps work with completion tokens by @bmerry in #293
• Implement range-based for loop over ring_stream by @bmerry in #294
• Speed up sending with generic segmentation offload by @bmerry in #295
• Bump actions/setup-python from 4 to 5 by @dependabot in #296
• Make packet_generator::next_packet work in-place by @bmerry in #298
• Eliminate deprecated boost::asio::null_buffers by @bmerry in #297
• Fix a couple of Python bindings for custom allocators by @bmerry in #301
• Update GH CI to use upload/download-artifact@v4 by @bmerry in #302
• CI: use curl for downloads instead of wget by @bmerry in #303
• Bump pypa/cibuildwheel from 2.16.2 to 2.16.4 by @dependabot in #305
• Update boost to 1.84 for building wheels by @bmerry in #306
• Support slice indexing on HeapReferenceList by @bmerry in #304
• Support ringbuffer iteration by @bmerry in #307
• Prepare 4.2.0 by @bmerry in #308

Full Changelog: v4.1.1...v4.2.0