chore(deps): update public.ecr.aws/neuron/neuron-device-plugin docker tag to v2.15.6.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
public.ecr.aws/neuron/neuron-device-plugin	kubernetes_daemon_set_v1	minor	2.14.4.0 -> 2.15.6.0

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