provider/aws: Increase subnet deletion timeout

[radeksimko]

This is to address the following test failure:

=== RUN   TestAccAWSALBListener_basic
--- FAIL: TestAccAWSALBListener_basic (487.90s)
    testing.go:344: Error destroying resource! WARNING: Dangling resources
        may exist. The full state and error is shown below.
        
        Error: Error applying: 1 error(s) occurred:
        
        * aws_subnet.alb_test[1] (destroy): 1 error(s) occurred:
        
        * aws_subnet.alb_test.1: Error deleting subnet: timeout while waiting for state to become 'destroyed' (last state: 'pending', timeout: 5m0s)

[stack72]

:( LGTM

[ghost]

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