chore: bump up rustc version to v1.85.1 (#11140)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [rustc](https://redirect.github.com/rust-lang/rust) | patch | `1.85.0` -> `1.85.1` |

---

### Release Notes

<details>
<summary>rust-lang/rust (rustc)</summary>

### [`v1.85.1`](https://redirect.github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1851-2025-03-18)

[Compare Source](https://redirect.github.com/rust-lang/rust/compare/1.85.0...1.85.1)

\==========================

<a id="1.85.1"></a>

-   [Fix the doctest-merging feature of the 2024 Edition.](https://redirect.github.com/rust-lang/rust/pull/137899/)
-   [Relax some `target_feature` checks when generating docs.](https://redirect.github.com/rust-lang/rust/pull/137632/)
-   [Fix errors in `std::fs::rename` on Windows 10, version 1607.](https://redirect.github.com/rust-lang/rust/pull/137528/)
-   [Downgrade bootstrap `cc` to fix custom targets.](https://redirect.github.com/rust-lang/rust/pull/137460/)
-   [Skip submodule updates when building Rust from a source tarball.](https://redirect.github.com/rust-lang/rust/pull/137338/)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), 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/toeverything/AFFiNE).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOS4yMDcuMSIsInVwZGF0ZWRJblZlciI6IjM5LjIwNy4xIiwidGFyZ2V0QnJhbmNoIjoiY2FuYXJ5IiwibGFiZWxzIjpbImRlcGVuZGVuY2llcyJdfQ==-->

rust-toolchain.toml

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.85.0"
+channel = "1.85.1"
 profile = "default"