build(deps): bump fastapi-slim from 0.115.4 to 0.115.6 in /redis_events

Bumps [fastapi-slim](https://github.com/fastapi/fastapi) from 0.115.4 to 0.115.6.
- [Release notes](https://github.com/fastapi/fastapi/releases)
- [Commits](fastapi/fastapi@0.115.4...0.115.6)

---
updated-dependencies:
- dependency-name: fastapi-slim
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

redis_events/pyproject.toml

@@ -11,7 +11,7 @@ python = "^3.12"
 # explicitly installed with the plugin if desired.
 acapy-agent = { version = "~1.1.0", optional = true }
 aiohttp = "^3.9.5"
-fastapi-slim = "^0.115.4"
+fastapi-slim = "^0.115.6"
 nest-asyncio = "^1.5.5"
 redis = "^5.2.0"
 uvicorn = "^0.32.0"