Bump peg from 0.8.0 to 0.8.1 in /native (Instagram#783)

Bumps [peg](https://github.com/kevinmehall/rust-peg) from 0.8.0 to 0.8.1.
- [Release notes](https://github.com/kevinmehall/rust-peg/releases)
- [Commits](kevinmehall/rust-peg@0.8.0...0.8.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

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

native/libcst/Cargo.toml

@@ -32,7 +32,7 @@ trace = ["peg/trace"]
 paste = "1.0.9"
 pyo3 = { version = "0.17", optional = true }
 thiserror = "1.0.37"
-peg = "0.8.0"
+peg = "0.8.1"
 chic = "1.2.2"
 itertools = "0.10.5"
 once_cell = "1.15.0"