_remove_session bug causing sign_up to fail

[jpan8866]

Bug report

• [x] I confirm this is a bug with Supabase, not with my own application.
• [x] I confirm I have searched the Docs, GitHub Discussions, and Discord.

Describe the bug

A clear and concise description of what the bug is.

When using async client's auth.sign_up, it will fail due to _remove_session. Specifically, the line

await self._storage.remove_item(self._storage_key)

will error out due to remove_item returning None.

To Reproduce

Try to use auth.signup with async client

Expected behavior

A clear and concise description of what you expected to happen.

Screenshots

Error removing session: object NoneType can't be used in 'await' expression

System information

macOS

Additional context

Add any other context about the problem here.

[silentworks]

Please provide a reproducible example repo. I can't replicate this from my end.