chore(deps): update helm release vault to v0.18.0

This MR contains the following updates:

Package	Update	Change
vault (source)	minor	0.16.1 -> 0.18.0

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Release Notes

hashicorp/vault-helm

v0.18.0

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CHANGES:

• Removed support for deploying a leader-elector container with the vault-k8s injector injector since vault-k8s now uses an internal mechanism to determine leadership GH-649
• Vault image default 1.9.0
• Vault K8s image default 0.14.1

Improvements:

• Added templateConfig.staticSecretRenderInterval chart option for the injector GH-621

v0.17.1

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Improvements:

• Add option for Ingress PathType GH-634

v0.17.0

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KNOWN ISSUES:

• The chart will fail to deploy on Kubernetes 1.19+ with server.ingress.enabled=true because no pathType is set

CHANGES:

• Vault image default 1.8.4
• Vault K8s image default 0.14.0

Improvements:

• Support Ingress stable networking API GH-590
• Support setting the externalTrafficPolicy for LoadBalancer and NodePort service types GH-626
• Support setting ingressClassName on server Ingress GH-630

Bugs:

• Ensure kubeletRootDir volume path and mounts are the same when csi.daemonSet.kubeletRootDir is overridden GH-628

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