Simpler file chunking

[adamjstewart]

Now that Python 3.8 is the minimum supported version, we can use the new assignment expression syntax to simplify how we read files chunk-by-chunk. There are many other places where this could be used but they were a bit more complicated so I didn't bother with those.

[pytorch-bot]

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❌ 33 New Failures

As of commit 6bfab3e:

NEW FAILURES - The following jobs have failed:

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[pmeier]

LGTM after https://github.com/pytorch/vision/pull/7673/files#r1233075816 and CI is green. Thanks @adamjstewart!

[pmeier]

Could you remove the io import in the relocate.py script?

https://github.com/pytorch/vision/actions/runs/5314674815/jobs/9622150942?pr=7673#step:10:378

[github-actions]

Hey @pmeier!

You merged this PR, but no labels were added. The list of valid labels is available at https://github.com/pytorch/vision/blob/main/.github/process_commit.py