Chore(deps): Update pydantic[dotenv] requirement in /stac_fastapi/api

Updates the requirements on [pydantic[dotenv]](https://github.com/pydantic/pydantic) to permit the latest version.
- [Release notes](https://github.com/pydantic/pydantic/releases)
- [Changelog](https://github.com/pydantic/pydantic/blob/main/HISTORY.md)
- [Commits](pydantic/pydantic@v0.0.2...v2.3.0)

---
updated-dependencies:
- dependency-name: pydantic[dotenv]
  dependency-type: direct:production
...

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

stac_fastapi/api/setup.py

@@ -7,7 +7,7 @@
 
 install_requires = [
     "attrs",
-    "pydantic[dotenv]<2",
+    "pydantic[dotenv]<3",
     "stac_pydantic==2.0.*",
     "brotli_asgi",
     "stac-fastapi.types",