[ci/requirements] Remove gluoncv

[krfricke]

Why are these changes needed?

Following up from #37067, also remove the gluoncv dependency.

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[pcmoritz]

Nice, do we also want to remove it from

ray/doc/source/ray-overview/pip_freeze_ray-ml-py39-cpu.txt

Line 131 in 98e7731

gluoncv==0.10.5.post0

?

[pcmoritz]

@krfricke Do you still need to do the above removal #37129 (comment) before we merge this?

[krfricke]

@krfricke Do you still need to do the above removal #37129 (comment) before we merge this?

I think we can just update this when we do the next periodic update, but yes I've removed it for now