Update to FastAPI 0.103

This commit will update/upgrade to
[FastAPI 0.103](https://fastapi.tiangolo.com/release-notes/).

FastAPI 0.103 adds support for an `openapi_examples` keyword argument
as described in the
[docs](https://fastapi.tiangolo.com/tutorial/schema-extra-example/#openapi-specific-examples)
and sets a temporary upper bound on AnyIO of `anyio>=3.7.1,<4.0.0`,
separately from Starlette, to help with the update to Starlette 0.31.

pyproject.toml

@@ -45,7 +45,7 @@ docs = [
   "mkdocs-material>=8,<9",
 ]
 fastapi = [
-  "fastapi>=0.102,<0.103",
+  "fastapi>=0.103,<0.104",
 ]
 starlette = [
   "starlette>=0.27,<0.28",