clusterctl 1.8.4

[BrewTestBot]

Created by brew bump

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Created with brew bump-formula-pr.

release notes

## 👌 Kubernetes version support

Management Cluster: v1.27.x -> v1.31.x
Workload Cluster: v1.25.x -> v1.31.x

More information about version support can be found here
Changes since v1.8.3
:chart_with_upwards_trend: Overview

15 new commits merged
2 bugs fixed 🐛

:bug: Bug Fixes

CI: Hack: fix the shell used when running pr-verify (#11170)
ClusterClass: Fix nil pointer for empty workers in webhook (#11198)

:seedling: Others

CI: Pr-verify: use env var for passing the PR title (#11230)
CI: Replace kubebuilder-release-tools with new workflow (#11167)
CI: Switch to using ECR mirror for trivy DB repo in weekly security scan (#11261)
ClusterCacheTracker: Add cacheSyncPeriod option to ClusterCacheTracker (#11249)
clusterctl: Add vultr infrastructure provider (#11217)
clusterctl: Bump cert manager to v1.16.0 (#11264)
clusterctl: Update RKE2 provider URL (#11225)
e2e: Test/e2e: decrease concurrency (#11222)
Logging: Reduce verbosity of logs when calling Runtime Extensions (#11200)
Machine: Prevent error spamming for NodeOutdatedTaint if objects are not found (#11199)
Testing: Test/framework: allow users to modify cache.Options (#11203)
Testing: Test/framework: GetCAPIResources should warn on rbac issues (#11206)

:book: Additionally, there has been 1 contribution to our documentation and book. (#11177)
Dependencies
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Nothing has changed.
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Nothing has changed.
Thanks to all our contributors! 😊

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