Update dependency test/httpx to v0.26.0 (#15)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [test/httpx](https://togithub.com/encode/httpx)
([changelog](https://togithub.com/encode/httpx/blob/master/CHANGELOG.md))
| `==0.25.2` -> `==0.26.0` |
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|
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|
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|
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|

---

### Release Notes

<details>
<summary>encode/httpx (test/httpx)</summary>

###
[`v0.26.0`](https://togithub.com/encode/httpx/blob/HEAD/CHANGELOG.md#0260-20th-December-2023)

[Compare
Source](https://togithub.com/encode/httpx/compare/0.25.2...0.26.0)

##### Added

- The `proxy` argument was added. You should use the `proxy` argument
instead of the deprecated `proxies`, or use `mounts=` for more complex
configurations.
([#&#8203;2879](https://togithub.com/encode/httpx/issues/2879))

##### Deprecated

- The `proxies` argument is now deprecated. It will still continue to
work, but it will be removed in the future.
([#&#8203;2879](https://togithub.com/encode/httpx/issues/2879))

##### Fixed

- Fix cases of double escaping of URL path components. Allow / as a safe
character in the query portion.
([#&#8203;2990](https://togithub.com/encode/httpx/issues/2990))
- Handle `NO_PROXY` envvar cases when a fully qualified URL is supplied
as the value.
([#&#8203;2741](https://togithub.com/encode/httpx/issues/2741))
- Allow URLs where username or password contains unescaped '@&#8203;'.
([#&#8203;2986](https://togithub.com/encode/httpx/issues/2986))
- Ensure ASGI `raw_path` does not include URL query component.
([#&#8203;2999](https://togithub.com/encode/httpx/issues/2999))
- Ensure `Response.iter_text()` cannot yield empty strings.
([#&#8203;2998](https://togithub.com/encode/httpx/issues/2998))

</details>

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Author: jessemyers-lettuce

pyproject.toml

@@ -31,7 +31,7 @@ style = [
 
 test = [
   "pytest==7.4.3",
-  "httpx==0.25.2"
+  "httpx==0.26.0"
 ]
 
 types = [