chore: checkpoint before Python removal

vendor/atomic-waker/README.md

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+# atomic-waker
+
+[![Build](https://github.com/smol-rs/atomic-waker/workflows/Build%20and%20test/badge.svg)](
+https://github.com/smol-rs/atomic-waker/actions)
+[![License](https://img.shields.io/badge/license-Apache--2.0_OR_MIT-blue.svg)](
+https://github.com/smol-rs/atomic-waker)
+[![Cargo](https://img.shields.io/crates/v/atomic-waker.svg)](
+https://crates.io/crates/atomic-waker)
+[![Documentation](https://docs.rs/atomic-waker/badge.svg)](
+https://docs.rs/atomic-waker)
+
+`futures::task::AtomicWaker` extracted into its own crate.
+
+## License
+
+Licensed under either of
+
+ * Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+#### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.