fix(deps): update dependency prometheus-client to ^0.20.0 (#248)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [prometheus-client](https://togithub.com/prometheus/client_python) |
`^0.19.0` -> `^0.20.0` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/prometheus-client/0.20.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/prometheus-client/0.20.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/prometheus-client/0.19.0/0.20.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/prometheus-client/0.19.0/0.20.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>prometheus/client_python (prometheus-client)</summary>

###
[`v0.20.0`](https://togithub.com/prometheus/client_python/releases/tag/v0.20.0):
0.20.0 / 2024-02-14

[Compare
Source](https://togithub.com/prometheus/client_python/compare/v0.19.0...v0.20.0)

#### What's Changed

- \[CHANGE/BUGFIX] Update OpenMetrics Content Type to 1.0.0.
[#&#8203;997](https://togithub.com/prometheus/client_python/issues/997)
- \[FEATURE] Enable graceful shutdown for start\_{http,wsgi}\_server by
returning the server and thread.
[#&#8203;999](https://togithub.com/prometheus/client_python/issues/999)
- \[FEATURE] Allow resetting counter metrics.
[#&#8203;1005](https://togithub.com/prometheus/client_python/issues/1005)
- \[BUGFIX] wsgi server: address family discovery is not quite right.
[#&#8203;1006](https://togithub.com/prometheus/client_python/issues/1006)

</details>

---

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pyproject.toml

@@ -24,7 +24,7 @@ python = ">=3.9"
 click = "^8.0.1"
 httpx = "^0.26.0"
 lxml = "^4.6.3"
-prometheus-client = "^0.19.0"
+prometheus-client = "^0.20.0"
 pydantic = "^2.0.0"
 typing-extensions = "^4.2.0"
 python-dotenv = "^1.0.0"