Python dependency: Update flask-security-too requirement

Updates the requirements on [flask-security-too](https://github.com/pallets-eco/flask-security) to permit the latest version.
- [Release notes](https://github.com/pallets-eco/flask-security/releases)
- [Changelog](https://github.com/pallets-eco/flask-security/blob/main/CHANGES.rst)
- [Commits](pallets-eco/flask-security@5.6.0...5.7.0)

---
updated-dependencies:
- dependency-name: flask-security-too
  dependency-version: 5.7.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -27,7 +27,7 @@ Flask-Mail==0.*
 Flask-Migrate==4.*
 Flask-Paranoid==0.*
 Flask-Security-Too==5.4.*; python_version <= '3.9'
-Flask-Security-Too==5.6.*; python_version > '3.9'
+Flask-Security-Too==5.7.*; python_version > '3.9'
 Flask-SocketIO==5.5.*
 Flask-SQLAlchemy==3.1.*
 Flask-WTF==1.2.*