[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/psf/black: 21.4b0 → 21.4b2](psf/black@21.4b0...21.4b2)
- [github.com/asottile/pyupgrade: v2.13.0 → v2.14.0](asottile/pyupgrade@v2.13.0...v2.14.0)

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
 -   repo: https://github.com/psf/black
-    rev: 21.4b0
+    rev: 21.4b2
     hooks:
     -   id: black
         args: [--safe, --quiet]
@@ -34,7 +34,7 @@ repos:
     -   id: reorder-python-imports
         args: ['--application-directories=.:src', --py36-plus]
 -   repo: https://github.com/asottile/pyupgrade
-    rev: v2.13.0
+    rev: v2.14.0
     hooks:
     -   id: pyupgrade
         args: [--py36-plus]