chore(deps): update precommit hook pycqa/flake8 to v3.9.0

This MR contains the following updates:

Package	Type	Update	Change
pycqa/flake8	repository	minor	3.8.4 -> 3.9.0

---

Release Notes

pycqa/flake8

v3.9.0

Compare Source

---

Renovate configuration

📅 Schedule: At any time (no schedule defined).

🚦 Automerge: Enabled.

♻️ Rebasing: Whenever MR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this MR and you won't be reminded about this update again.

---

• If you want to rebase/retry this MR, check this box

---

This MR has been generated by Renovate Bot.