* Bump dtolnay/rust-toolchain
Bumps [dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain) from 55c7845fad90d0ae8b2e83715cb900e5e861e8cb to e645b0cf01249a964ec099494d38d2da0f0b349f.
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](
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| .. | ||
| ISSUE_TEMPLATE | ||
| workflows | ||
| CODEOWNERS | ||
| dependabot.yml | ||
| FUNDING.yml | ||
| ISSUE_TEMPLATE.md | ||
| PULL_REQUEST_TEMPLATE.md | ||
| SUPPORT.md | ||