fix(aws): cli version upgrade to support eks subcommands

[pieterza]

I've used halyard to install spinnaker 1.14.8 onto it's own kubernetes (eks) cluster as per documentation.

I also have an EKS target to which I want to deploy, but spinnaker currently errors during a deploy manifest step:

`
s3 | configure
deploy | configservice
opsworks-cm | history
help

Invalid choice: 'eks', maybe you meant:

es error: unable to recognize "STDIN": Get https://07FB762B0FC0E678218E6AFF82087860.yl4.eu-west-1.eks.amazonaws.com/api?timeout=32s: getting credentials: exec: exit status 2
`

This is due to the awscli command inside the clouddriver container being too old, and the expected aws subcommand eks is missing.

Fix is to upgrade to aws 1.16.x

See error:

`
s3 | configure
deploy | configservice
opsworks-cm | history
help

Invalid choice: 'eks', maybe you meant:

es error: unable to recognize "STDIN": Get https://07FB762B0FC0E678218E6AFF82087860.yl4.eu-west-1.eks.amazonaws.com/api?timeout=32s: getting credentials: exec: exit status 2
`

This change bumps the hardcoded version to 1.16.145

[spinnakerbot]

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• 62bf9d2: Support aws eks ...

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[pieterza]

@spinnaker-release please review as this is a hard bug for EKS deployments.

[pieterza]

Bump & more context.

AWS updated their CLI in May 2019 to do the authentication without requiring external tools such as heptio https://aws.amazon.com/about-aws/whats-new/2019/05/amazon-eks-simplifies-kubernetes-cluster-authentication/
As such the awscli subcommand of eks needs to be present to use these new kubeconfig files.

Please do upgrade the awscli to latest, or the version in this PR (which I have tested).

[pieterza]

cc @xavileon

[xavileon]

The change looks good to me, but don't have approve permissions (nor specific knowledge on this part of the codebase). Maybe @robzienert or @ezimanyi can point us to the some one with the knowledge?