build(deps): bump the rust-dependencies group with 5 updates (#13070)

Bumps the rust-dependencies group with 5 updates:

| Package | From | To |
| --- | --- | --- |
| [tempfile](https://github.com/Stebalien/tempfile) | `3.17.1` | `3.18.0` |
| [once_cell](https://github.com/matklad/once_cell) | `1.20.3` | `1.21.0` |
| [serde](https://github.com/serde-rs/serde) | `1.0.218` | `1.0.219` |
| [tokio](https://github.com/tokio-rs/tokio) | `1.43.0` | `1.44.0` |
| [indexmap](https://github.com/indexmap-rs/indexmap) | `2.7.1` | `2.8.0` |


Updates `tempfile` from 3.17.1 to 3.18.0
- [Changelog](https://github.com/Stebalien/tempfile/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Stebalien/tempfile/compare/v3.17.1...v3.18.0)

Updates `once_cell` from 1.20.3 to 1.21.0
- [Changelog](https://github.com/matklad/once_cell/blob/master/CHANGELOG.md)
- [Commits](https://github.com/matklad/once_cell/compare/v1.20.3...v1.21.0)

Updates `serde` from 1.0.218 to 1.0.219
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](https://github.com/serde-rs/serde/compare/v1.0.218...v1.0.219)

Updates `tokio` from 1.43.0 to 1.44.0
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](https://github.com/tokio-rs/tokio/compare/tokio-1.43.0...tokio-1.44.0)

Updates `indexmap` from 2.7.1 to 2.8.0
- [Changelog](https://github.com/indexmap-rs/indexmap/blob/main/RELEASES.md)
- [Commits](https://github.com/indexmap-rs/indexmap/compare/2.7.1...2.8.0)

---
updated-dependencies:
- dependency-name: tempfile
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: rust-dependencies
- dependency-name: once_cell
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: rust-dependencies
- dependency-name: serde
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: rust-dependencies
- dependency-name: tokio
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: rust-dependencies
- dependency-name: indexmap
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: rust-dependencies
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

helix-stdx/Cargo.toml

@@ -18,7 +18,7 @@ ropey.workspace = true
 which = "7.0"
 regex-cursor = "0.1.5"
 bitflags.workspace = true
-once_cell = "1.20"
+once_cell = "1.21"
 regex-automata = "0.4.9"
 unicode-segmentation.workspace = true