chore(deps): Bump spin in /src/code-validator/guest

Bumps spin from 0.10.0 to 0.12.0.

---
updated-dependencies:
- dependency-name: spin
  dependency-version: 0.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

src/code-validator/guest/Cargo.lock

@@ -24,7 +24,7 @@ serde = { version = "1", default-features = false, features = ["derive", "alloc"
 serde_json = { version = "1", default-features = false, features = ["alloc"] }
 regex-automata = { version = "0.4", default-features = false, features = ["alloc", "meta", "nfa-pikevm"] }
 nom = { version = "8.0", default-features = false, features = ["alloc"] }
-spin = "0.10"
+spin = "0.12"
 rquickjs = { version = "0.11", default-features = false, features = ["bindgen", "loader"] }
 hashbrown = "0.17"
 sha2 = { version = "0.11", default-features = false }