🌱 Bump helm.sh/helm/v3 from 3.16.4 to 3.18.4 - Fix CVEs

[kbsteere]

What this PR does / why we need it:
Upgrade helm to latest fixes the following:
Medium CVE-2025-32386 GHSA-4hfp-h4cw-hj8p fixed in 3.17.3
High CVE-2025-53547 GHSA-557j-xg8c-q2mm fixed in 3.17.4
Medium CVE-2025-32387 GHSA-5xqw-8hwv-wg92 fixed in 3.17.3

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 failing PR that dependabot tried applying: https://github.com/kubernetes-sigs/cluster-api-addon-provider-helm/pull/412/files

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: kbsteere / name: Kyle Steere (8179017, 0966c40)

[k8s-ci-robot]

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @kbsteere. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[jarias-lfx]

/easycla

[kbsteere]

@dmvolod can you review?

[dmvolod]

/ok-to-test

[dmvolod]

@dmvolod can you review?

It seems to not so easy to bump Cluster API to the v1.10.4. Please see #386 its still in progress.
@kbsteere , after it can be merged, you can continue to work on your PR.

[k8s-ci-robot]

@kbsteere: The following tests 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-addon-provider-helm-verify-main	8179017	link	true	/test pull-cluster-api-addon-provider-helm-verify-main
pull-cluster-api-addon-provider-helm-apidiff-main	8179017	link	false	/test pull-cluster-api-addon-provider-helm-apidiff-main
pull-cluster-api-addon-provider-helm-capi-e2e	8179017	link	false	/test pull-cluster-api-addon-provider-helm-capi-e2e
pull-cluster-api-addon-provider-helm-e2e	8179017	link	true	/test pull-cluster-api-addon-provider-helm-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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[k8s-ci-robot]

PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.