[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/PyCQA/flake8: 3.9.2 → 4.0.1](PyCQA/flake8@3.9.2...4.0.1)
- [github.com/pre-commit/mirrors-mypy: v0.910 → v0.910-1](pre-commit/mirrors-mypy@v0.910...v0.910-1)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -9,7 +9,7 @@ repos:
       - id: check-added-large-files
       - id: debug-statements
   - repo: https://github.com/PyCQA/flake8
-    rev: "3.9.2"
+    rev: "4.0.1"
     hooks:
       - id: flake8
         additional_dependencies: [flake8-import-order, flake8-bugbear]
@@ -28,7 +28,7 @@ repos:
     -   id: pyupgrade
         args: [--py37-plus]
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: "v0.910"
+    rev: "v0.910-1"
     hooks:
       - id: mypy
         files: vdirsyncer/.*