AWS plugin README lacks entries for velero 1.16 and AWS plugin 1.12

[languitar]

What steps did you take and what happened:

The README of the AWS plugin lacks entries in the compatibility matrix for the new release 1.12.

What did you expect to happen:

Velero compatibility is documented

The following information will help us better understand what's going on:

not relevant here

Anything else you would like to add:

Environment:

not relevant for the issue

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[hu-keyu]

Please assign this issue to me.