🌱 Update CAPI support and guarantees for v1.9

[Sunnatillo]

What this PR does / why we need it:

This PR updates the supported versions for the next release cycle (1.9).

Which issue(s) this PR fixes (optional, in fixes #(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Task description is here: https://github.com/kubernetes-sigs/cluster-api/tree/main/docs/release/role-handbooks/communications#update-supported-versions

Part of: #11092

@kubernetes-sigs/cluster-api-release-team

/area documentation

[k8s-ci-robot]

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[tormath1]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 044e01aae8bf80f89493dda7134148437591241e

[fabriziopandini]

Please dedup with #11163 before moving on

[fabriziopandini]

one nit.
Also PTAL #11163 (review)

[fabriziopandini]

Table formatting seems off (same for other changes)

[Sunnatillo]

We can merge @chandankumar4's PR

[fabriziopandini]

/close
as per comment above

[k8s-ci-robot]

@fabriziopandini: Closed this PR.

In response to this:

/close
as per comment above

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