fix: use expected line ending in codex-rs/core/config.schema.json (#10977)

Fixes a line ending that was altered in https://github.com/openai/codex/pull/10861.

This is breaking the release due to:

a118494323/.github/workflows/rust-release.yml (L54-L55)

This PR updates the test to check for this so we should catch it in CI (or when running tests locally):

a118494323/codex-rs/core/src/config/schema.rs (L105-L131)

codex-rs/core/config.schema.json

@@ -1629,4 +1629,4 @@
   },
   "title": "ConfigToml",
   "type": "object"
-}
+}