Update fastapi requirement from ~=0.95 to ~=0.115 in /requirements

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@0.95.0...0.115.6)

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

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

requirements/requirements.txt

@@ -1,5 +1,5 @@
 ovos-plugin-manager>=0.0.25,<1.0.0
-fastapi~=0.95
+fastapi~=0.115
 uvicorn~=0.30
 gradio~=3.28
 ovos-utils>=0.0.38,<1.0.0