chore: checkpoint before Python removal

vendor/deadpool-runtime/README.md

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+# Deadpool runtime abstraction [![Latest Version](https://img.shields.io/crates/v/deadpool-runtime.svg)](https://crates.io/crates/deadpool-runtime) ![Unsafe forbidden](https://img.shields.io/badge/unsafe-forbidden-success.svg "Unsafe forbidden") [![Rust 1.75+](https://img.shields.io/badge/rustc-1.75+-lightgray.svg "Rust 1.75+")](https://blog.rust-lang.org/2023/12/28/Rust-1.75.0.html)
+
+Deadpool is a dead simple async pool for connections and objects
+of any type.
+
+This crate provides a simple `Runtime` enum that can be used to
+target multiple runtimes. This crate avoids boxed futures and
+and only implements things actually needed by the `deadpool` crates.
+
+**Note:** This crate is intended for making the development of
+`deadpool-*` crates easier. Other libraries and binary projects
+normally should not use this directly and use some provided
+reexports by the crates using it.
+
+## Features
+
+| Feature | Description | Extra dependencies | Default |
+| ------- | ----------- | ------------------ | ------- |
+| `tokio_1` | Enable support for [tokio](https://crates.io/crates/tokio) crate | `tokio/time`, `tokio/rt` | no |
+| `async-std_1` | Enable support for [async-std](https://crates.io/crates/config) crate | `async-std` | no |
+
+## 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.