Only PBKDF2PasswordHasher supports str and bytes password

[Jason Held]

The other password hashers in their encode method all at some point call .encode on their password in some way. Thus, the other hasher classes, in the django source code, do not support the API and docstring of make_password.
This seems pretty easy to fix on the whole and I'd be happy to make a PR for it.

[Sarah Boyce]

Replicated thank you! PRs welcome

tests/auth_tests/test_hashers.py

@@ -520 +520 @@
                     with self.assertRaisesMessage(ValueError, msg):
                         hasher.encode("password", salt)
 
+    def test_password_bytes(self):
+        hasher_classes = [
+            MD5PasswordHasher,
+            PBKDF2PasswordHasher,
+            PBKDF2SHA1PasswordHasher,
+            ScryptPasswordHasher,
+        ]
+        for hasher_class in hasher_classes:
+            hasher = hasher_class()
+            with self.subTest(hasher_class.__name__):
+                encoded = hasher.encode(b"password", hasher.salt())
+                self.assertTrue(hasher.verify(b"password", encoded))
+
     def test_encode_password_required(self):
         hasher_classes = [
             MD5PasswordHasher,