Pin mypy to current version

Author: QuLogic

.github/workflows/reviewdog.yml

@@ -62,7 +62,7 @@ jobs:
       - name: Install Python dependencies
         run: |
           python -m pip install --upgrade pip
-          python -m pip install --upgrade mypy
+          python -m pip install --upgrade mypy==1.2.0
 
       - name: Install cycler
         run: |