[1.30] Updates RT Slack groups

[katcosgrove]

Adds the release team to Slack groups for v1.30 cycle.

cc: @kubernetes/sig-release-leads

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[k8s-ci-robot]

PR needs rebase.

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/lifecycle stale

[neoaggelos]

@katcosgrove should this still go in before doing 1.31?

[justaugustus]

@katcosgrove should this still go in before doing 1.31?

Closing in favor of https://github.com/kubernetes/community/pull/7919. Kat, can you leave the branch around for @neoaggelos to pick up, per https://github.com/kubernetes/community/pull/7919#pullrequestreview-2092137673?

(Sorry for missing this during the v1.30 cycle!)

/close

[k8s-ci-robot]

@justaugustus: Closed this PR.

In response to this:

@katcosgrove should this still go in before doing 1.31?

Closing in favor of https://github.com/kubernetes/community/pull/7919. Kat, can you leave the branch around for @neoaggelos to pick up, per https://github.com/kubernetes/community/pull/7919#pullrequestreview-2092137673?

(Sorry for missing this during the v1.30 cycle!)

/close

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