Async-interrupt

Feature

* Improve performance of entering the context manager ([13](https://github.com/bdraco/async_interrupt/issues/13)) ([`fab2218`](https://github.com/bdraco/async_interrupt/commit/fab2218d31383e42fa12e0cb6d76fd611d8ca997))
* Python 3.13 support ([14](https://github.com/bdraco/async_interrupt/issues/14)) ([`ec49fee`](https://github.com/bdraco/async_interrupt/commit/ec49fee2bd9233f77a0f5fd597ff06c2db528c92))

Fix

* Fix license classifier ([4](https://github.com/bdraco/async_interrupt/issues/4)) ([`f8e3791`](https://github.com/bdraco/async_interrupt/commit/f8e37914c24125ea69690d8bc01ad210a19b8d68))

Fix

* Add pytest-asyncio to dev deps to fix tests ([3](https://github.com/bdraco/async_interrupt/issues/3)) ([`38d268a`](https://github.com/bdraco/async_interrupt/commit/38d268a18f8bc9a7751b11e661e103dda5b886ef))

Feature

* Add coverage for external cancel ([2](https://github.com/bdraco/async_interrupt/issues/2)) ([`e5e21a2`](https://github.com/bdraco/async_interrupt/commit/e5e21a23101e687f94580e089429e64978ee99bb))