renovatebot(deps): update dependency locust to v2.18.3

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [locust](https://togithub.com/locustio/locust) | `==2.18.1` -> `==2.18.3` | [![age](https://developer.mend.io/api/mc/badges/age/pypi/locust/2.18.3?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/locust/2.18.3?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/locust/2.18.1/2.18.3?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/locust/2.18.1/2.18.3?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

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

### [`v2.18.3`](https://togithub.com/locustio/locust/blob/HEAD/CHANGELOG.md#2183-2023-11-12)

[Compare Source](https://togithub.com/locustio/locust/compare/2.18.2...2.18.3)

[Full Changelog](https://togithub.com/locustio/locust/compare/2.18.2...2.18.3)

**Closed issues:**

-   Add Modern UI HTML Report to --html Option [#&#8203;2458](https://togithub.com/locustio/locust/issues/2458)

**Merged pull requests:**

-   List Andrew as maintainer of the Modern web UI [#&#8203;2460](https://togithub.com/locustio/locust/pull/2460) ([cyberw](https://togithub.com/cyberw))
-   Add Modern UI HTML Report to --html Option [#&#8203;2459](https://togithub.com/locustio/locust/pull/2459) ([andrewbaldwin44](https://togithub.com/andrewbaldwin44))
-   Modern UI: Add sorting to columns on statistics page and downloaded report [#&#8203;2453](https://togithub.com/locustio/locust/pull/2453) ([andrewbaldwin44](https://togithub.com/andrewbaldwin44))

### [`v2.18.2`](https://togithub.com/locustio/locust/blob/HEAD/CHANGELOG.md#2182-2023-11-10)

[Compare Source](https://togithub.com/locustio/locust/compare/2.18.1...2.18.2)

[Full Changelog](https://togithub.com/locustio/locust/compare/2.18.1...2.18.2)

**Fixed bugs:**

-   2.18 - fasthttp error for no content response [#&#8203;2450](https://togithub.com/locustio/locust/issues/2450)
-   Segmentation fault running the locust command [#&#8203;2447](https://togithub.com/locustio/locust/issues/2447)

**Merged pull requests:**

-   Add terraform variables [#&#8203;2455](https://togithub.com/locustio/locust/pull/2455) ([sdarwin](https://togithub.com/sdarwin))
-   FastHttpUser: encoding return str when response is empty [#&#8203;2451](https://togithub.com/locustio/locust/pull/2451) ([scottARob](https://togithub.com/scottARob))
-   Fix docs: modern UI developing guide [#&#8203;2446](https://togithub.com/locustio/locust/pull/2446) ([zifter](https://togithub.com/zifter))

</details>

---

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---

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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==2.18.1
+locust==2.18.3
 MarkupSafe==2.1.3
 msgpack-python==0.5.6
 pyzmq==25.1.1