Bump serde_tokenstream from 0.2.0 to 0.2.1 in /src/wasm-lib (#2648)

Bumps [serde_tokenstream](https://github.com/oxidecomputer/serde_tokenstream) from 0.2.0 to 0.2.1.
- [Release notes](https://github.com/oxidecomputer/serde_tokenstream/releases)
- [Commits](https://github.com/oxidecomputer/serde_tokenstream/compare/v0.2.0...v0.2.1)

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

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

src/wasm-lib/Cargo.lock

@@ -2679,9 +2679,9 @@ dependencies = [
 
 [[package]]
 name = "serde_tokenstream"
-version = "0.2.0"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a00ffd23fd882d096f09fcaae2a9de8329a328628e86027e049ee051dc1621f"
+checksum = "8790a7c3fe883e443eaa2af6f705952bc5d6e8671a220b9335c8cae92c037e74"
 dependencies = [
  "proc-macro2",
  "quote",