Update sqlalchemy requirement from <1.5,>=1.3.0 to >=1.3.0,<2.1

Updates the requirements on [sqlalchemy](https://github.com/sqlalchemy/sqlalchemy) to permit the latest version.
- [Release notes](https://github.com/sqlalchemy/sqlalchemy/releases)
- [Changelog](https://github.com/sqlalchemy/sqlalchemy/blob/main/CHANGES.rst)
- [Commits](https://github.com/sqlalchemy/sqlalchemy/commits)

---
updated-dependencies:
- dependency-name: sqlalchemy
  dependency-type: direct:production
...

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

setup.cfg

@@ -45,7 +45,7 @@ install_requires =
     qrcode>=7.1,<8
     requests>=2.22,<3
     SQLAlchemy-Continuum>=1.3.12,<2
-    SQLAlchemy>=1.3.0,<1.5  # New 1.4 changes API, see #728
+    SQLAlchemy>=1.3.0,<2.1  # New 1.4 changes API, see #728
     python-dateutil
 
 [options.extras_require]