Update dependency sqlalchemy to v2.0.21

Author: renovate[bot]

requirements.txt

@@ -34,7 +34,7 @@ pyflakes==3.1.0 ; python_version >= "3.10" and python_version < "4.0"
 pymysql==1.1.0 ; python_version >= "3.10" and python_version < "4.0"
 python-dotenv==1.0.0 ; python_version >= "3.10" and python_version < "4.0"
 redis==5.0.0 ; python_version >= "3.10" and python_version < "4.0"
-sqlalchemy==2.0.20 ; python_version >= "3.10" and python_version < "4.0"
+sqlalchemy==2.0.21 ; python_version >= "3.10" and python_version < "4.0"
 tomli==2.0.1 ; python_version >= "3.10" and python_version < "3.11"
 typing-extensions==4.7.1 ; python_version >= "3.10" and python_version < "4.0"
 webassets==2.0 ; python_version >= "3.10" and python_version < "4.0"