build(deps): bump pest from 2.8.3 to 2.8.4 (#502)

Bumps [pest](https://github.com/pest-parser/pest) from 2.8.3 to 2.8.4.
- [Release notes](https://github.com/pest-parser/pest/releases)
- [Commits](pest-parser/pest@v2.8.3...v2.8.4)

---
updated-dependencies:
- dependency-name: pest
  dependency-version: 2.8.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Cargo.lock

@@ -7,7 +7,7 @@ description = "Parse DTrace provider definitions into Rust"
 repository = "https://github.com/oxidecomputer/usdt.git"
 
 [dependencies]
-pest = "2.8.3"
+pest = "2.8.4"
 pest_derive = "2.8.3"
 thiserror = "2.0.17"