cluster-api-provider-openstack: Update agenda URL

[mdbooth]

Updates the CAPO office hours agenda link to the redirect we added in https://github.com/kubernetes-sigs/cluster-api-provider-openstack/pull/2125

[stmcginnis]

Link redirect works for me.

/lgtm

[fabriziopandini]

/lgtm /approve

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/lifecycle stale

[mdbooth]

/remove-lifecycle stale

[Priyankasaggu11929]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fabriziopandini, mdbooth, Priyankasaggu11929

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