fix(deps): update dependency fastapi to v0.121.3 (#271)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [fastapi](https://redirect.github.com/fastapi/fastapi)
([changelog](https://fastapi.tiangolo.com/release-notes/)) | `==0.121.2`
-> `==0.121.3` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/fastapi/0.121.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/fastapi/0.121.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/fastapi/0.121.2/0.121.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/fastapi/0.121.2/0.121.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v0.121.3`](https://redirect.github.com/fastapi/fastapi/releases/tag/0.121.3)

#### 0.121.3

##### Refactors

- ♻️ Make the result of `Depends()` and `Security()` hashable, as a
workaround for other tools interacting with these internal parts. PR
[#&#8203;14372](https://redirect.github.com/fastapi/fastapi/pull/14372)
by [@&#8203;tiangolo](https://redirect.github.com/tiangolo).

##### Upgrades

- ⬆️ Bump Starlette to <`0.51.0`. PR
[#&#8203;14282](https://redirect.github.com/fastapi/fastapi/pull/14282)
by [@&#8203;musicinmybrain](https://redirect.github.com/musicinmybrain).

##### Docs

- 📝 Add missing hash part. PR
[#&#8203;14369](https://redirect.github.com/fastapi/fastapi/pull/14369)
by [@&#8203;nilslindemann](https://redirect.github.com/nilslindemann).
- 📝 Fix typos in code comments. PR
[#&#8203;14364](https://redirect.github.com/fastapi/fastapi/pull/14364)
by [@&#8203;Edge-Seven](https://redirect.github.com/Edge-Seven).
- 📝 Add docs for using FastAPI Cloud. PR
[#&#8203;14359](https://redirect.github.com/fastapi/fastapi/pull/14359)
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 = "==3.14.0"
 dependencies = [
-    "fastapi[standard-no-fastapi-cloud-cli]==0.121.2",
+    "fastapi[standard-no-fastapi-cloud-cli]==0.121.3",
     "pillow==12.0.0",
     # 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