chore(deps): update terraform vault to v3.20.0

This MR contains the following updates:

Package	Type	Update	Change
vault (source)	required_provider	minor	3.19.0 -> 3.20.0

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Release Notes

hashicorp/terraform-provider-vault

v3.20.0

Compare Source

FEATURES:

• Add support for setting permanently_delete argument on resource_azure_secret_backend_role: (#​1958)
• Add use_sts_region_from_client to AWS Auth Config: (#​1963)
• Add accessor attribute for vault_gcp_auth_backend resource: (#​1980)

BUGS:

• Fixes a panic that can occur when Vault lookup-self API returns nil token info (#​1978)
• Resolve TF state for PKI Multi-Issuer workflows: (#​1973)
• Check the seal-status on the default namespace: (#​1967)

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