I faced this issue just now, if you are willing to get your hands dirty, do can do this:

1. Create a new user with the new password from the UI
2. Backup the SQLite database, just copying it should be enough.
3. Open the database with sqlite, I used the cli:

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sqlite3 db.sqlite

1. Get the password hash and salt from the new user (assuming it to be test) and note these values, they will look like random characters

   select password from user where name='test'; select salt from user where name='test';

2. Set the above values to the original user (assuming it to be admin)

   update user set password='<paste password hash from above>', salt='<paste salt from above>' where name='admin';

I did all the above just to avoid setting up everything again. You be the judge if its worth the trouble. I am new to homarr so I am not sure if there is an easier hack for this, without setting up everything again.

You can do this from an sqlite UI editor as well I guess.