Bump fastapi from 0.115.12 to 0.118.0

Bumps [fastapi](https://github.com/fastapi/fastapi) from 0.115.12 to 0.118.0.
- [Release notes](https://github.com/fastapi/fastapi/releases)
- [Commits](fastapi/fastapi@0.115.12...0.118.0)

---
updated-dependencies:
- dependency-name: fastapi
  dependency-version: 0.118.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

backend/requirements.txt

@@ -25,7 +25,7 @@ epitran==1.26.0
 nltk==3.9.1
 wordfreq==3.1.1
 # API dependencies
-fastapi==0.115.12
+fastapi==0.118.0
 uvicorn[standard]==0.34.3
 # Performance dependencies
 xformers==0.0.30