(improvement) remove support for protocols <3 from cython files #412

Job	Run time
Test wheels building / Prepare matrix to run for 3.13 on `linux,macos-x86,macos-arm,windows,linux-aarch64`	3s
Test wheels building / Build source distribution	14s
Test wheels building / Build wheels for windows on windows-2022	57m 35s
Test wheels building / Build wheels for macos-x86 on macos-15-intel	29m 30s
Test wheels building / Build wheels for macos-arm on macos-14	19m 18s
Test wheels building / Build wheels for linux-aarch64 on ubuntu-24.04-arm	19m 26s
Test wheels building / Build wheels for linux on ubuntu-24.04	21m 10s
Test wheels building / upload_pypi	0s
	2h 27m 16s

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