Add argon2 type to PasswordHashType interface (#1384)

## Description

Add argon2 type to PasswordHashType interface

## Documentation

Does this require changes to the WorkOS Docs? E.g. the [API
Reference](https://workos.com/docs/reference) or code snippets need
updates.

```
[ ] Yes
```

If yes, link a related docs PR and add a docs maintainer as a reviewer.
Their approval is required.

Author: awolfden

src/user-management/interfaces/password-hash-type.interface.ts

@@ -1 +1,6 @@
-export type PasswordHashType = 'bcrypt' | 'firebase-scrypt' | 'ssha' | 'scrypt';
+export type PasswordHashType =
+  | 'bcrypt'
+  | 'firebase-scrypt'
+  | 'ssha'
+  | 'scrypt'
+  | 'argon2';