chore(deps): update msrv (3 versions) to v1.85 (#15668)

This PR contains the following updates:

| Package | Update | Change | Pending |
|---|---|---|---|
| [MSRV:3](https://redirect.github.com/rust-lang/rust) | minor | `1.84`
-> `1.85` | `1.87` (+1) |

---

### Release Notes

<details>
<summary>rust-lang/rust (MSRV:3)</summary>

###
[`v1.85`](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/1.84.0...1.85.0)

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

<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 - Every minute ( * * * * * ) (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/rust-lang/cargo).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MC41MC4wIiwidXBkYXRlZEluVmVyIjoiNDAuNTAuMCIsInRhcmdldEJyYW5jaCI6Im1hc3RlciIsImxhYmVscyI6W119-->

Cargo.toml

@@ -11,7 +11,7 @@ exclude = [
 ]
 
 [workspace.package]
-rust-version = "1.84"  # MSRV:3
+rust-version = "1.85"  # MSRV:3
 edition = "2021"
 license = "MIT OR Apache-2.0"
 homepage = "https://github.com/rust-lang/cargo"