pyproject.toml: limit SQLAlchemy to < 1.4.23

SQLAlchemy gets pulled in by csvkit's agate-sql dependency and there
is currently an issue with Poetry's parsing of the SQLAlchemy 1.4.23
constraints. Temporarily explicitly install a version of SQLAlchemy
that works (can remove later once Poetry fixes this). Anyways, I am
not using any SQLAlchemy features that I know of.

See: https://github.com/python-poetry/poetry/issues/4402

pyproject.toml

@@ -22,6 +22,7 @@ langid = "^1.1.6"
 colorama = "^0.4.4"
 spdx-license-list = "^0.5.2"
 ftfy = "^5.9"
+SQLAlchemy = ">=1.3.3,<1.4.23"
 
 [tool.poetry.dev-dependencies]
 pytest = "^6.1.1"