chore(deps): bump openai-agents in /apps/orchestrator

Bumps [openai-agents](https://github.com/openai/openai-agents-python) from 0.7.0 to 0.13.3.
- [Release notes](https://github.com/openai/openai-agents-python/releases)
- [Changelog](https://github.com/openai/openai-agents-python/blob/main/docs/release.md)
- [Commits](openai/openai-agents-python@v0.7.0...v0.13.3)

---
updated-dependencies:
- dependency-name: openai-agents
  dependency-version: 0.13.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

apps/orchestrator/requirements.txt

@@ -27,7 +27,7 @@ google-genai==1.68.0
 # TEMP BLOCKER: current runtime imports `agents.*` modules in
 # `apps/orchestrator/src/cortexpilot_orch/**`; removing this now breaks runtime.
 # Minimal fallback for now is to keep this dependency until agents runtime is migrated.
-openai-agents==0.7.0
+openai-agents==0.13.3
 temporalio==1.22.0
 duckduckgo-search==8.1.1