adapt annotations for SQLAlchemy 2.x

It is not possible to produce type annotations that work with both
versions 1.4 and 2.0. So keep to the principle of only supporting
newest versions when it comes to mypy. This means that some types
may have to be string quoted to not cause issues when running with
SQLAlchemy 1.4.

docs/develop/Development-Environment.md

@@ -64,7 +64,7 @@ sudo apt install php-cgi phpunit php-codesniffer \
 
 pip3 install --user behave mkdocs mkdocstrings pytest pylint \
                     mypy types-PyYAML types-jinja2 types-psycopg2 types-psutil \
-                    types-ujosn \
+                    types-ujosn types-requests typing-extensions\
                     sanic-testing httpx asgi-lifespan
 ```