🌱 Bump CAPI to 1.8.6

[nrb]

What type of PR is this?

/kind failing-test

What this PR does / why we need it:

Brings CAPI to 1.8.6 specifically for PRs kubernetes-sigs/cluster-api#11303 and kubernetes-sigs/cluster-api#11478

This appears to address on-going failures we see in CAPA CI where the capa-e2e.[It] [unmanaged] [Cluster API Framework] Self Hosted Spec Should pivot the bootstrap cluster to a self-hosted cluster
case has been failing on the Kubernetes 1.29.8 to 1.29.9 step continuously.

My investigations of the logs showed that the most obvious errors were with webhooks during this step, something mentioned in kubernetes-sigs/cluster-api#11133

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

Fully fixing the periodic failures will probably need #5242 and #5239, but I think the failures addressed by the CAPI updates are the most common.

Checklist:

• includes emojis

Release note:

Upgrade to CAPI 1.8.6

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

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[nrb]

/test pull-cluster-api-provider-aws-e2e

[richardcase]

Updates for CAPI v1.8.5 also need to be made to:

• unmanaged e2e config file: https://github.com/kubernetes-sigs/cluster-api-provider-aws/blob/main/test/e2e/data/e2e_conf.yaml
• managed e2e config file: https://github.com/kubernetes-sigs/cluster-api-provider-aws/blob/main/test/e2e/data/e2e_eks_conf.yaml
• Versions file: https://github.com/kubernetes-sigs/cluster-api-provider-aws/blob/main/versions.mk

[damdo]

Will need a retitle to 1.8.6

[nrb]

/test pull-cluster-api-provider-aws-e2e

[k8s-ci-robot]

@nrb: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cluster-api-provider-aws-e2e	9b4d685	link	false	/test pull-cluster-api-provider-aws-e2e

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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