chore(deps): update dtolnay/rust-toolchain digest to 888c2e1

This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | dtolnay/rust-toolchain | action | digest | `c5a29dd` -> `888c2e1` | --- ### Configuration 📅 **Schedule**: Branch creation - "* 0-3 * * 1" (UTC), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR was generated by [Mend Renovate](https://mend.io/renovate/). View the [repository job log](https://developer.mend.io/github/wcampbell0x2a/zerus). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOS4yMDAuMCIsInVwZGF0ZWRJblZlciI6IjM5LjIwMC4wIiwidGFyZ2V0QnJhbmNoIjoibWFzdGVyIiwibGFiZWxzIjpbXX0=-->