Update robustness meeting time

[jmhbnz]

As outlined in kubernetes/community#8165 we are moving the fortnightly robustness team meeting to 11:00 PST in line with our other meetings.

This needs to be updated in https://etcd.io/community.

[jmhbnz]

/assign @samuelbartels20

[k8s-ci-robot]

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/assign @samuelbartels20

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[samuelbartels20]

@jmhbnz Please assign this issue to me