Thanks for your trick! I can finally get access to phpMyAdmin now 🙂
However, I tried to look into the file you specified for the database connection error, but I do not find any wp-config.php file in my WordPress directory. The only one I have is a wp-config-sample.php. Should I create it myself?
Thanks for your answer! As you said, the displayed password was my old one, so I tried to modify it on the confing.inc.php file. Unfortunately, I still can’t access the phpMyAdmin page. Is there any other file that could lead to this error?