Disable renovate PRs on the .pre-commit-config.yaml which is templated from synthtool. https://docs.renovatebot.com/configuration-options/#ignorepaths

Source-Author: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>
Source-Date: Mon Mar 15 09:05:39 2021 -0600
Source-Repo: googleapis/synthtool
Source-Sha: 2c54c473779ea731128cea61a3a6c975a08a5378
Source-Link: googleapis/synthtool@2c54c47

This change should be non-destructive.

Note for library repo maintainers:
After applying this change, you can easily add (or change) periodic
builds against head by adding config files in google3.

See python-pubsub repo for example.

Source-Author: Takashi Matsuo <tmatsuo@google.com>
Source-Date: Fri Mar 19 11:17:59 2021 -0700
Source-Repo: googleapis/synthtool
Source-Sha: 79c8dd7ee768292f933012d3a69a5b4676404cda
Source-Link: googleapis/synthtool@79c8dd7

[![WhiteSource Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [pycqa/flake8](https://gitlab.com/pycqa/flake8) | repository | minor | `3.8.4` -> `3.9.0` |

---

### Release Notes

<details>
<summary>pycqa/flake8</summary>

### [`v3.9.0`](https://gitlab.com/pycqa/flake8/compare/3.8.4...3.9.0)

[Compare Source](https://gitlab.com/pycqa/flake8/compare/3.8.4...3.9.0)

</details>

---

### Renovate configuration

:date: **Schedule**: At any time (no schedule defined).

:vertical_traffic_light: **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

:recycle: **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

:no_bell: **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [WhiteSource Renovate](https://renovate.whitesourcesoftware.com). View repository job log [here](https://app.renovatebot.com/dashboard#github/googleapis/synthtool).

Source-Author: WhiteSource Renovate <bot@renovateapp.com>
Source-Date: Tue Mar 23 17:38:03 2021 +0100
Source-Repo: googleapis/synthtool
Source-Sha: f5c5904fb0c6aa3b3730eadf4e5a4485afc65726
Source-Link: googleapis/synthtool@f5c5904