chore(deps): update terraform vault to v4.8.0

This MR contains the following updates:

Package	Type	Update	Change
vault (source)	required_provider	minor	4.7.0 -> 4.8.0

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Release Notes

hashicorp/terraform-provider-vault (vault)

v4.8.0

Compare Source

FEATURES:

• Add support for recursive search in data_vault_namespaces #​2408
• Add support for subscribe_event_types in data_source_policy_document #​2445
• Add support for explicit_max_ttl in vault_azure_secret_backend_role resources. Requires Vault 1.18+ (#​2438).

BUGS:

• Fix credential validation failures in vault_azure_access_credentials data source caused by Azure RBAC propagation delays using azure_groups #​2437

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