Allow building with Cython 3.2.0

[bbhtt]

Is your feature request related to a problem?

Build fails with Cython 3.2.0

        running egg_info
        creating src/propcache.egg-info
        writing src/propcache.egg-info/PKG-INFO
        writing dependency_links to src/propcache.egg-info/dependency_links.txt
        writing top-level names to src/propcache.egg-info/top_level.txt
        writing manifest file 'src/propcache.egg-info/SOURCES.txt'
        reading manifest file 'src/propcache.egg-info/SOURCES.txt'
        reading manifest template 'MANIFEST.in'
        warning: no directories found matching 'propcache'
        warning: no previously-included files matching '*.cache' found anywhere in distribution
        warning: no previously-included files found matching 'src/propcache/*.c'
        warning: no previously-included files found matching 'src/propcache/*.html'
        warning: no previously-included files found matching 'src/propcache/*.so'
        warning: no previously-included files found matching 'src/propcache/*.pyd'
        no previously-included directories found matching 'docs/_build'
        adding license file 'LICENSE'
        adding license file 'NOTICE'
        writing manifest file 'src/propcache.egg-info/SOURCES.txt'
        ERROR Missing dependencies:
        	Cython~=3.1.0
        Command 'python -P -mbuild --no-isolation --wheel --outdir /buildstream-build/dist .' failed with exitcode 1

Describe the solution you'd like

The constraint here needs bumping

propcache/packaging/pep517_backend/_backend.py

Line 379 in 3a8c2d0

c_ext_build_deps = ['Cython ~= 3.1.0']

Describe alternatives you've considered

N/A

Additional context

N/A

Code of Conduct

• I agree to follow the aio-libs Code of Conduct

[webknjaz]

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