chore(deps): update terraform vault to v3.15.2

This MR contains the following updates:

Package	Type	Update	Change
vault (source)	required_provider	minor	3.12.0 -> 3.15.2

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Release Notes

hashicorp/terraform-provider-vault

v3.15.2

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BUGS:

• Revert #​1830 which introduced a unexpected breaking change in the way authentication is done within a namespace: (#​1840)

v3.15.1

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BUGS:

• Ensure that the auth_login honours the provider's namespace: (#​1830)

v3.15.0

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FEATURES:

• Add support for MongoDB Atlas Secrets engine: (#​1816)

BUGS:

• Fix panic while importing namespaces: (#​1818)
• Avoid writing empty strings to Vault when creating PKCS managed keys: (#​1803)
• Fix possible panic with autopilot import: (#​1801)
• Ensure that the qr_size can be properly configured for MFA TOTP: (#​1750)

v3.14.0

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FEATURES:

• Add PKI Unified CRL parameters: (#​1789)
• Add resource for GCP impersonated account support: (#​1745)

BUGS:

• Add nil check for IsEnterpriseSupported util: (#​1787)
• Fix KV incorrect metadata path for prefixed mounts: (#​1781)

v3.13.0

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FEATURES:

• Add new resource for AWS Auth Backend config identity: (#​1724)
• Support default_user_template field on vault_ssh_secret_backend_role: (#​1725)

IMMROVEMENTS:

• Secrets from the AD, AWS, Azure & Nomad Secrets Engines are sensitive: (#​1726)
• Add enterprise check for new Raft Autopilot parameter: (#​1721)

BUGS:

• Fix KVV2 datasource upon retrieval of soft deleted secrets: (#​1760)
• Fix issue where removing optional fields in database secrets backend connection resource did not reset the fields to their default values: (#​1737)
• Fix construction of metadata path in KV V2 resource: (#​1722)

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