[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/pre-commit/mirrors-mypy: v0.990 → v0.991](https://github.com/pre-commit/mirrors-mypy/compare/v0.990...v0.991)
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 04eb05b..10d72ea 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -38,7 +38,7 @@
           - flake8-bugbear
         args: ["--extend-ignore=E203", "--max-line-length=88"]
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.990
+    rev: v0.991
     hooks:
       - id: mypy
         exclude: (docs|pyfakefs/tests)