[r0.14-cherry-pick] :arrow_up: `tensorflow-macos==2.6.0`

[lgeiger]

This cherry-picks #2582 onto the 0.14 release branch.

/cc @bhack

[bhack]

The CI is failing

[lgeiger]

The CI is failing

@bhack the failures look unrelated to me, since they x86 tests are also failing which weren't touched in this PR. Maybe this is due to the fact that recently GitHub updated macos-latest to point to macos-11?

[bhack]

Probably you need to cherry-pick https://github.com/tensorflow/addons/pull/2580

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[lgeiger]

Probably you need to cherry-pick #2580

Good idea, just did that. Let's see what CI thinks

[bhack]

@seanpmorgan you need to consent the bot for the CLA on this cherry-pick

[bhack]

Please check https://github.com/tensorflow/federated/issues/1254#issuecomment-962461866

[arslan-raza-143]

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