Update fastapi requirement from ~=0.115.0 to ~=0.115.2

Updates the requirements on [fastapi](https://github.com/fastapi/fastapi) to permit the latest version.
- [Release notes](https://github.com/fastapi/fastapi/releases)
- [Commits](fastapi/fastapi@0.115.0...0.115.2)

---
updated-dependencies:
- dependency-name: fastapi
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -1,4 +1,4 @@
-fastapi~=0.115.0
+fastapi~=0.115.2
 pydantic>=2.7.0,<3.0.0
 pydantic-settings~=2.5.2
 jinja2~=3.1.4