Automated cherry pick of #8022: Bump cilium version to 1.6.4

[olemarkus]

Cherry pick of #8022 on release-1.16.

#8022: Bump cilium version to 1.6.4

For details on the cherry pick process, see the cherry pick requests page.

[k8s-ci-robot]

Hi @olemarkus. Thanks for your PR.

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[geojaz]

/ok-to-test

[justinsb]

Thanks @olemarkus - looks like some important fixes. Not sure if the envoy fixes in 1.6.5 are relevant to our usage (?)

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: justinsb, olemarkus

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