Revert to previous version of mypy due to false positive

.pre-commit-config.yaml

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index ea95672..312e307 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -26,7 +26,7 @@
       - id: flake8
         additional_dependencies: [flake8-comprehensions]
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.930
+    rev: v0.910-1
     hooks:
       - id: mypy
         files: requests_cache