Fix default setting for hash algorithm for FAB password hash (#51858)

The dpgaspar/Flask-AppBuilder#2332 introduced
new configuration parameter, where it defaulted hash algorithm for
passwords to "scrypt". However with our (old) version of Werkzeug,
scrypt is not supported and default should be set to "pbkdf2:sha256"

Fixes: 51854

Author: potiuk

providers/fab/src/airflow/providers/fab/auth_manager/security_manager/override.py

@@ -784,12 +784,14 @@ def _init_config(self):
 
         parsed_werkzeug_version = Version(werkzeug_version)
         if parsed_werkzeug_version < Version("3.0.0"):
+            app.config.setdefault("FAB_PASSWORD_HASH_METHOD", "pbkdf2:sha256")
             app.config.setdefault(
                 "AUTH_DB_FAKE_PASSWORD_HASH_CHECK",
                 "pbkdf2:sha256:150000$Z3t6fmj2$22da622d94a1f8118"
                 "c0976a03d2f18f680bfff877c9a965db9eedc51bc0be87c",
             )
         else:
+            app.config.setdefault("FAB_PASSWORD_HASH_METHOD", "scrypt")
             app.config.setdefault(
                 "AUTH_DB_FAKE_PASSWORD_HASH_CHECK",
                 "scrypt:32768:8:1$wiDa0ruWlIPhp9LM$6e409d093e62ad54df2af895d0e125b05ff6cf6414"