[Requirements] Bump fastapi and uvicorn

[alonmr]

Effected changes:

• Remove --debug flag encode/uvicorn#1640
• Replace HTTP client on TestClient from requests to httpx encode/starlette#1376
• HTTPX Client delete method does not support body - https://www.python-httpx.org/compatibility/#request-body-on-http-methods
• The requests test client is able to encode enums as their values in query parameters. With httpx we no longer have this privilege. The QueryParams class not is mapping enums to their values but to their representing string e.g. ProjectsFormat.full into the string "ProjectsFormat.full" instead of "full".

[quaark]

LGTM, just need to test the functionality with triggering migrations not via SDK.
And then all's good

[Tankilevitch]

Looks very good, I would prefer that the from mlrun.api.utils import StrEnum will be changed to import mlrun.api.utils to reduce possibility for circular imports