Bumps [dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain) from d8352f6b1d2e870bc5716e7a6d9b65c4cc244a1a to a54c7afa936fefeb4456b2dd8068152669aa8203.
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](d8352f6b1d...a54c7afa93
)
---
updated-dependencies:
- dependency-name: dtolnay/rust-toolchain
dependency-type: direct:production
...
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