Fix lightning hyperparameter tuning examples

[BenWilson2]

Related Issues/PRs

#xxx

What changes are proposed in this pull request?

fix dependency pinning with pytorch examples using ax-platform and typeguard

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[BenWilson2]

Latest versions of ax-platform seem to have these issues resolved, according to the linked issue comments and release notes.

[BenWilson2]

... and they didn't address them. Their latest release still has the issue with columns unable to be referenced as a set. Putting this pinning back in.

[harupy]

LGTM!