Fix mypy version

requirements/base.txt

@@ -83,7 +83,7 @@ psycopg2-binary==2.9.3  # https://github.com/psycopg/psycopg2
 
 # Testing
 # ------------------------------------------------------------------------------
-mypy==1.8.1  # https://github.com/python/mypy
+mypy==1.8.0  # https://github.com/python/mypy
 pytest>=7.4.3  # https://github.com/pytest-dev/pytest
 pytest-sugar==0.9.7  # https://github.com/Frozenball/pytest-sugar
 pytest-cov==4.1.0