build(deps): bump serde_spanned from 0.6.7 to 0.6.8 (#33555)

Bumps [serde_spanned](https://github.com/toml-rs/toml) from 0.6.7 to 0.6.8.
- [Commits](https://github.com/toml-rs/toml/compare/serde_spanned-v0.6.7...serde_spanned-v0.6.8)

---
updated-dependencies:
- dependency-name: serde_spanned
  dependency-type: indirect
  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>

Cargo.lock

@@ -5981,9 +5981,9 @@ dependencies = [
 
 [[package]]
 name = "serde_spanned"
-version = "0.6.7"
+version = "0.6.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eb5b1b31579f3811bf615c144393417496f152e12ac8b7663bf664f4a815306d"
+checksum = "87607cb1398ed59d48732e575a4c28a7a8ebf2454b964fe3f224f2afc07909e1"
 dependencies = [
  "serde",
 ]