Do not overwrite a concrete type with None in the bindings table #240

Job	Run time
windows (aarch64-pc-windows-msvc, x64)	5m 20s
macos (aarch64, arm64)	2m 46s
linux (x86_64-unknown-linux-gnu)	3m 22s
linux (aarch64-unknown-linux-gnu)	3m 47s
windows (x86_64-pc-windows-msvc, x64)	6m 31s
macos (x86_64, x64)	4m 11s
sdist	2m 53s
Test with Python 3.12	5s
Test with Python 3.14	6s
Merge artifacts	9s
	29m 10s

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