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Out of curiosity, is this useful or needed for a specific PR/issue?

_min_dependencies.py should not be updated too often if not needed, even if we can rely on more recent versions for build dependencies, contrary to runtime dependencies.

I don't want to force contributors to always upgrade to the latest version of Cython if they don't need to.

EDIT: this change is mandated by #28603 although it's net yet obvious to me which part of this PR requires the Cython version bump.

Also side-comment, note that the nogil build needs some coordination work with Sam Gross, if we update the min Cython dependency, see for example colesbury/nogil-wheels#6.

For now the nogil lock-file is updated manually outside of the update_environment_and_lock_files.py script ...

It‘s required for a bugfix of fused types used in a method of a cython.final extension type.

I resolved the conflict. Let me do a re-run of the update lock file script just to be sure.

If everything is green, I am fine with merging this version update if it makes it easier for other concurrent PRs on HGBDT.

Actually, let's wait for #28653 and then re-run the lock script on this PR.

EDIT: fixed PR number.

For reference, I opened the PR to build the Cython 3.0.9 wheel for nogil:

• Cython 3.0.9 colesbury/nogil-wheels#7

I opened #28654 to update the nogil CI separately.

#28555 was merged and some of the lock files need another update as a consequence. Let me push another commit.

@ogrisel Thanks for taking over!

Merging, thanks!