removed pinning mypy to old version

fhenneke · fhenneke · commit b638d981aaf7 · 2024-09-20T09:51:20.000+02:00
this caused an issue with tests
diff --git a/requirements/dev.txt b/requirements/dev.txt
@@ -2,4 +2,4 @@
 black==22.8.0
 pylint==2.15.0
 pytest==7.1.3
-mypy==0.971
+mypy
