chore: checkpoint before Python removal

vendor/lru-slab/README.md

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+# lru-slab
+
+[![License: Apache 2.0](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](LICENSE-APACHE)
+[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](LICENSE-MIT)
+[![License: Zlib](https://img.shields.io/badge/License-Zlib-blue.svg)](LICENSE-ZLIB)
+
+Pre-allocated storage with constant-time LRU tracking
+
+Useful managing elements in an external cache of fixed-size pages,
+e.g. an array texture in GPU memory.
+
+## License
+
+Licensed under any 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)
+ * Zlib license ([LICENSE-ZLIB](LICENSE-ZLIB) or
+   https://opensource.org/licenses/Zlib)
+
+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
+triple licensed as above, without any additional terms or conditions.