fix(deps): update dependency fastapi to v0.136.3 (#594)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Adoption](https://docs.renovatebot.com/merge-confidence/) |
[Passing](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|---|---|
| [fastapi](https://redirect.github.com/fastapi/fastapi)
([changelog](https://fastapi.tiangolo.com/release-notes/)) | `==0.136.1`
→ `==0.136.3` |
![age](https://developer.mend.io/api/mc/badges/age/pypi/fastapi/0.136.3?slim=true)
|
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|
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|
![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/fastapi/0.136.1/0.136.3?slim=true)
|

---

### Release Notes

<details>
<summary>fastapi/fastapi (fastapi)</summary>

###
[`v0.136.3`](https://redirect.github.com/fastapi/fastapi/releases/tag/0.136.3)

[Compare
Source](https://redirect.github.com/fastapi/fastapi/compare/0.136.1...0.136.3)

##### Refactors

- ♻️ Do not accept underscore headers when using
`convert_underscores=True` (the default). PR
[#&#8203;15589](https://redirect.github.com/fastapi/fastapi/pull/15589)
by [@&#8203;tiangolo](https://redirect.github.com/tiangolo).

</details>

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pyproject.toml

@@ -5,7 +5,7 @@ description = "BSS file server API"
 authors = [{ name = "Bence Csik", email = "[email protected]" }]
 requires-python = "==3.14.5"
 dependencies = [
-    "fastapi[standard-no-fastapi-cloud-cli]==0.136.1",
+    "fastapi[standard-no-fastapi-cloud-cli]==0.136.3",
     "pillow==12.2.0",
     # this should be part of standard-no-fastapi-cloud-cli, but is missing:
     # see: https://github.com/fastapi/fastapi/blob/6fae64ff49e8328048872714652a4dfa15406e41/pyproject.toml#L94-L98