chore(deps): update terraform vault to v4.2.0

v4.2.0

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FEATURES:

• Add granularity to Secrets Sync destination resources. Requires Vault 1.16+ Enterprise. (#​2202)
• Add support for allowed_kubernetes_namespace_selector in vault_kubernetes_secret_backend_role (#​2180).
• Add new data source vault_namespace. Requires Vault Enterprise: (#​2208).
• Add new data source vault_namespaces. Requires Vault Enterprise: (#​2212).

IMPROVEMENTS:

• Enable Secrets Sync Association resource to track sync status across all subkeys of a secret. Requires Vault 1.16+ Enterprise. (#​2202)

BUGS:

• fix vault_approle_auth_backend_role_secret_id regression to handle 404 errors (#​2204)
• fix vault_kv_secret and vault_kv_secret_v2 failure to update secret data modified outside terraform (#​2207)
• fix vault_kv_secret_v2 failing on imported resource when data_json should be ignored (#​2207)