[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/asottile/pyupgrade: v2.21.0 → v2.21.2](asottile/pyupgrade@v2.21.0...v2.21.2)
- [github.com/psf/black: 21.6b0 → 21.7b0](psf/black@21.6b0...21.7b0)
- https://gitlab.com/pycqa/flake8 → https://github.com/PyCQA/flake8

.pre-commit-config.yaml

@@ -31,13 +31,13 @@ repos:
     exclude: ^noxfile.py$
 
 - repo: https://github.com/asottile/pyupgrade
-  rev: v2.21.0
+  rev: v2.21.2
   hooks:
   - id: pyupgrade
 
 # Black, the code formatter, natively supports pre-commit
 - repo: https://github.com/psf/black
-  rev: 21.6b0
+  rev: 21.7b0
   hooks:
   - id: black
     # By default, this ignores pyi files, though black supports them
@@ -51,7 +51,7 @@ repos:
   - id: remove-tabs
 
 # Flake8 also supports pre-commit natively (same author)
-- repo: https://gitlab.com/pycqa/flake8
+- repo: https://github.com/PyCQA/flake8
   rev: 3.9.2
   hooks:
   - id: flake8