Update Rust crate libc to v0.2.169 (zed-industries#22427)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [libc](https://redirect.github.com/rust-lang/libc) |
workspace.dependencies | patch | `0.2.168` -> `0.2.169` |

---

### Release Notes

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

###
[`v0.2.169`](https://redirect.github.com/rust-lang/libc/releases/tag/0.2.169)

[Compare
Source](https://redirect.github.com/rust-lang/libc/compare/0.2.168...0.2.169)

##### Added

- FreeBSD: add more socket TCP stack constants
[#&zed-industries#8203;4193](https://redirect.github.com/rust-lang/libc/pull/4193)
- Fuchsia: add a `sockaddr_vm` definition
[#&zed-industries#8203;4194](https://redirect.github.com/rust-lang/libc/pull/4194)

##### Fixed

**Breaking**:
[rust-lang/rust#132975](https://redirect.github.com/rust-lang/rust/pull/132975)
corrected the signedness of `core::ffi::c_char` on various Tier 2 and
Tier 3 platforms (mostly Arm and RISC-V) to match Clang. This release
contains the corresponding changes to `libc`, including the following
specific pull requests:

- ESP-IDF: Replace arch-conditional `c_char` with a reexport
[#&zed-industries#8203;4195](https://redirect.github.com/rust-lang/libc/pull/4195)
- Fix `c_char` on various targets
[#&zed-industries#8203;4199](https://redirect.github.com/rust-lang/libc/pull/4199)
- Mirror `c_char` configuration from `rust-lang/rust`
[#&zed-industries#8203;4198](https://redirect.github.com/rust-lang/libc/pull/4198)

##### Cleanup

- Do not re-export `c_void` in target-specific code
[#&zed-industries#8203;4200](https://redirect.github.com/rust-lang/libc/pull/4200)

</details>

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Release Notes:

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