chore: [autoapprove] Pin flake8 version (#662)

Source-Link: googleapis/synthtool@0ddbff8
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:bced5ca77c4dda0fd2f5d845d4035fc3c5d3d6b81f245246a36aee114970082b

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: gcf-owl-bot[bot]

.github/.OwlBot.lock.yaml

@@ -13,5 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
-  digest: sha256:6c1cbc75c74b8bdd71dada2fa1677e9d6d78a889e9a70ee75b93d1d0543f96e1
-# created: 2023-07-25T21:01:10.396410762Z
+  digest: sha256:bced5ca77c4dda0fd2f5d845d4035fc3c5d3d6b81f245246a36aee114970082b
+# created: 2023-08-01T17:41:45.434027321Z

.pre-commit-config.yaml

@@ -26,6 +26,6 @@ repos:
     hooks:
     - id: black
 -   repo: https://github.com/pycqa/flake8
-    rev: 3.9.2
+    rev: 6.1.0
     hooks:
     - id: flake8