Update dependency starlette to ^0.14.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
starlette	dependencies	minor	^0.13.8 -> ^0.14.0

---

Release Notes

encode/starlette

v0.14.1

Compare Source

Removed

• UJSONResponse was removed (this change was intended to be included in 0.14.0). Please see the documentation for how to implement responses using custom JSON serialization - #​1074.

v0.14.0

Compare Source

Added

• Starlette now officially supports Python3.9.
• In StreamingResponse, allow custom async iterator such as objects from classes implementing __aiter__.
• Allow usage of functools.partial async handlers in Python versions 3.6 and 3.7.
• Add 418 I'm A Teapot status code.

Changed

• Create tasks from handler coroutines before sending them to asyncio.wait.
• Use format_exception instead of format_tb in ServerErrorMiddleware's debug responses.
• Be more lenient with handler arguments when using the requires decorator.

---

Renovate configuration

📅 Schedule: At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻️ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR has been generated by WhiteSource Renovate. View repository job log here.

[ghost]

Thank you for contributing to Python Discord!

Please check out the following documents:

• Join the Discord server! - If you have not already, join the Discord server and introduce yourself in our #dev-contrib channel.
• Python Discord Code of Conduct – Code of conduct for our community
• Python Discord Contributor Wiki - A set of resources about setting up our services