ppc64le - fix test failures of TestBoundingBoxFromGeomT/GeographyType

[prashantkhoje]

Allow floating point approximation within an epsilon
Fixes #81733

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[cockroach-teamcity]

This change is 

[prashantkhoje]

I referred #66621.

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Thank you for updating your pull request.

Before a member of our team reviews your PR, I have some potential action items for you:

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[prashantkhoje]

@otan, please review.

[otan]

bors r+

[craig]

Build succeeded:

• GitHub CI (Cockroach)