[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/psf/black: 21.5b1 → 21.5b2](psf/black@21.5b1...21.5b2)
- [github.com/asottile/pyupgrade: v2.16.0 → v2.19.0](asottile/pyupgrade@v2.16.0...v2.19.0)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
 -   repo: https://github.com/psf/black
-    rev: 21.5b1
+    rev: 21.5b2
     hooks:
     -   id: black
         args: [--safe, --quiet, --target-version, py35]
@@ -17,7 +17,7 @@ repos:
     hooks:
     -   id: flake8
 -   repo: https://github.com/asottile/pyupgrade
-    rev: v2.16.0
+    rev: v2.19.0
     hooks:
     -   id: pyupgrade
         args: [--py3-plus]