Update Helm release vault to v0.27.0

[renovate]

This PR contains the following updates:

Package	Update	Change
vault (source)	minor	0.26.1 -> 0.27.0

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Release Notes

hashicorp/vault-helm (vault)

v0.27.0

Compare Source

Changes:

• Default vault version updated to 1.15.2

Features:

• server: Support setting persistentVolumeClaimRetentionPolicy on the StatefulSet GH-965
• server: Support setting labels on PVCs GH-969
• server: Support setting ingress rules for networkPolicy GH-877

Improvements:

• Support exec in the server liveness probe GH-971

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