Fix mypy check by pinning blinker version

ikonst · web-flow · commit 71a0873d6aa4 · 2023-04-20T22:29:18.000-04:00
diff --git a/requirements-dev.txt b/requirements-dev.txt
@@ -6,6 +6,7 @@ pytest-mock
 coveralls
 mypy==0.950;python_version>="3.7"
 pytest-cov
+blinker==1.5.0
 
 # used for type-checking
 botocore-stubs
