Fix wrong type (TerryHowe#449)

As discussed in TerryHowe#449, the type needs to be `list` instead of `type`.

ansible/modules/hashivault/hashivault_pki_role.py

@@ -124,7 +124,7 @@
                     - Although this parameter could take a string with comma-delimited items, it's highly advised to
                       not do so as it would break idempotency.
             allowed_other_sans:
-                type: type
+                type: list
                 description:
                     - Defines allowed custom OID/UTF8-string SANs
                     - Each item of the list has the same format as OpenSSL `<oid>;<type>:<value>`, but the only valid