renovatebot(deps): update dependency locust to v2.18.1

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [locust](https://togithub.com/locustio/locust) | `==2.18.0` -> `==2.18.1` | [![age](https://developer.mend.io/api/mc/badges/age/pypi/locust/2.18.1?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/locust/2.18.1?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/locust/2.18.0/2.18.1?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/locust/2.18.0/2.18.1?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>locustio/locust (locust)</summary>

### [`v2.18.1`](https://togithub.com/locustio/locust/releases/tag/2.18.1)

[Compare Source](https://togithub.com/locustio/locust/compare/2.18.0...2.18.1)

#### What's Changed

-   Modern UI shows wrong (old) hostname when setting hostname in start dialog by [@&#8203;andrewbaldwin44](https://togithub.com/andrewbaldwin44) in [https://github.com/locustio/locust/pull/2436](https://togithub.com/locustio/locust/pull/2436)
-   Fix for UserClass picker not loading all available Shape Classes by [@&#8203;mikenester](https://togithub.com/mikenester) in [https://github.com/locustio/locust/pull/2441](https://togithub.com/locustio/locust/pull/2441)
-   Add Log Viewer to Modern UI by [@&#8203;andrewbaldwin44](https://togithub.com/andrewbaldwin44) in [https://github.com/locustio/locust/pull/2440](https://togithub.com/locustio/locust/pull/2440)
-   Log unhandled exceptions thrown in User.on_start by [@&#8203;cyberw](https://togithub.com/cyberw) in [https://github.com/locustio/locust/pull/2442](https://togithub.com/locustio/locust/pull/2442)

**Full Changelog**: locustio/locust@2.18.0...2.18.1

</details>

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etc/loadtests/locust/requirements.txt

@@ -6,7 +6,7 @@ idna==3.4
 greenlet==3.0.1
 Jinja2==3.1.2
 itsdangerous==2.1.2
-locust==2.18.0
+locust==2.18.1
 MarkupSafe==2.1.3
 msgpack-python==0.5.6
 pyzmq==25.1.1