fix(pandas): use correct mime type for Parquet

[judahrand]

What does this PR address?

It is a shame that BentoML doesn't use the correct mime type for Parquet:
https://www.iana.org/assignments/media-types/application/vnd.apache.parquet

Here we move to using the correct mime type going forwards but accept the old mime type too.

Fixes #(issue)

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[judahrand]

@xianml I don't think these test failures are related to my changes

[frostming]

@xianml I don't think these test failures are related to my changes

They are: https://github.com/bentoml/BentoML/actions/runs/9458228250/job/26053392444?pr=4780

[judahrand]

@xianml I don't think these test failures are related to my changes

They are: https://github.com/bentoml/BentoML/actions/runs/9458228250/job/26053392444?pr=4780

These failures aren't the ones I'd seen before - I'll look into them!

[judahrand]

@xianml I don't think these test failures are related to my changes

They are: https://github.com/bentoml/BentoML/actions/runs/9458228250/job/26053392444?pr=4780

I think I fixed the issue (it was a typo) but the tests seem to still be failing oddly. Passing on some platforms but failing on others which is strange given that my changes have absolutely nothing platform specific. Are these flakes that you're aware of?

[frostming]

🎉 Thanks