Update dependency starlette to ^0.38.0 (#300)

| datasource | package   | from   | to     |
| ---------- | --------- | ------ | ------ |
| pypi       | starlette | 0.37.2 | 0.38.0 |

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

poetry.lock

@@ -7,7 +7,7 @@ license = "MIT"
 
 [tool.poetry.dependencies]
 python = "^3.12"
-starlette = "^0.37.2"
+starlette = "^0.38.0"
 nested_dict = "^1.61"
 uvicorn = { extras = ["standard"], version = "^0.30.1" }
 motor = "3.5.1"