Arch Linux

Description:

Without python-email-validator `pgadmin4` fails to start:

> "An error occurred initialising the pgAdmin 4 server:\n\nFailed to launch the application server, server thread exiting."

Using `pgadmin4-server` directly shows:

```
% pgadmin4-server
Traceback (most recent call last):
File "/usr/lib/pgadmin4/web/pgAdmin4.py", line 35, in <module>
import config
File "/usr/lib/pgadmin4/web/config.py", line 25, in <module>
from pgadmin.utils import env, IS_WIN, fs_short_path
File "/usr/lib/pgadmin4/web/pgadmin/__init__.py", line 28, in <module>
from flask_security import Security, SQLAlchemyUserDatastore, current_user
File "/usr/lib/python3.9/site-packages/flask_security/__init__.py", line 16, in <module>
from .core import Security, RoleMixin, UserMixin, AnonymousUser, current_user
File "/usr/lib/python3.9/site-packages/flask_security/core.py", line 33, in <module>
from .forms import (
File "/usr/lib/python3.9/site-packages/flask_security/forms.py", line 114, in <module>
email_validator = Email(message="INVALID_EMAIL_ADDRESS")
File "/usr/lib/python3.9/site-packages/flask_security/forms.py", line 82, in __init__
super(ValidatorMixin, self).__init__(*args, **kwargs)
File "/usr/lib/python3.9/site-packages/wtforms/validators.py", line 332, in __init__
raise Exception("Install 'email_validator' for email validation support.")
Exception: Install 'email_validator' for email validation support.
```

Installing `python-email-validator` fixes this, but for some yet unknown reason the server still fails to come up for me.
(this used to work before, and might actually be a problem with a dependency of `pgadmin4` instead, since the current version was installed at the beginning of February here already (and worked before).

Note that pgadmin4 is flagged out of date, and upgrading it might also change/fix this already maybe.

Additional info:
* pgadmin4 4.30-1

Steps to reproduce: