Update Helm release vault to v0.26.1

[renovate]

This PR contains the following updates:

Package	Update	Change
vault (source)	minor	0.25.0 -> 0.26.1

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Release Notes

hashicorp/vault-helm (vault)

v0.26.1

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Bugs:

• Fix templating of server.ha.replicas when set via override file. The 0.26.0 chart would ignore server.ha.replicas and always deploy 3 server replicas when server.ha.enabled=true unless overridden by command line when issuing the helm command: --set server.ha.replicas=<some_number>. Fixed in GH-961

v0.26.0

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Changes:

• Default vault version updated to 1.15.1
• Default vault-k8s version updated to 1.3.1
• Default vault-csi-provider version updated to 1.4.1
• Tested with Kubernetes versions 1.24-1.28
• server: OpenShift default readiness probe returns 204 when uninitialized GH-966

Features:

• server: Add support for dual stack clusters GH-833
• server: Support hostAliases for the StatefulSet pods GH-955
• server: Add server.service.active.annotations and server.service.standby.annotations GH-896
• server: Add long-lived service account token option GH-923

Bugs:

• csi: Add namespace field to csi-role and csi-rolebindings. GH-909

Improvements:

• global: Add global.namespace to override the helm installation namespace. GH-909
• server: use vault.fullname in Helm test GH-912
• server: Allow scaling HA replicas to zero GH-943

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