[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/pre-commit/mirrors-mypy: v0.910-1 → v0.920](pre-commit/mirrors-mypy@v0.910-1...v0.920)

.pre-commit-config.yaml

@@ -42,7 +42,7 @@ repos:
       - id: flake8
 
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.910-1
+    rev: v0.920
     hooks:
       - id: mypy
         args: [--disallow-untyped-defs, --ignore-missing-imports]