provider/aws: Increase timeout for (dis)associating IPv6 addr to subnet

[radeksimko]

This is to address the following test failure:

=== RUN   TestAccAWSSubnet_ipv6
--- FAIL: TestAccAWSSubnet_ipv6 (199.70s)
    testing.go:280: Step 2 error: Error applying: 1 error(s) occurred:
        
        * aws_subnet.foo: 1 error(s) occurred:
        
        * aws_subnet.foo: Error waiting for IPv6 CIDR (subnet-4c43b817) to become disassociated: timeout while waiting for state to become 'disassociated' (timeout: 1m0s)
FAIL

[stack72]

LGTM

[ghost]

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