Update amazon/amazon-eks-pod-identity-webhook Docker tag to v0.5.4

This MR contains the following updates:

Package	Type	Update	Change
amazon/amazon-eks-pod-identity-webhook		patch	v0.5.3 -> v0.5.4
amazon/amazon-eks-pod-identity-webhook	stage	patch	v0.5.3 -> v0.5.4

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