update 2.60.0 changelog to include a fix in Bigtable

[mutianf]

Add the bug fix in BigtableIO to the changelog of 2.60.0.

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[Abacn]

thanks, let's add the same item to CHANGES.md

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Reminder, please take a look at this pr: @melap

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[damccorm]

@mutianf could you please take a look at the comments above?

[github-actions]

Reminder, please take a look at this pr: @damccorm

[github-actions]

Assigning new set of reviewers because Pr has gone too long without review. If you would like to opt out of this review, comment assign to next reviewer:

R: @melap for label website.

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[damccorm]

@mutianf could you please take a look at the comments above?

[damccorm]

Thanks!

[damccorm]

I'll merge once checks pass