chore(deps): bump google-genai in /apps/orchestrator

Bumps [google-genai](https://github.com/googleapis/python-genai) from 1.72.0 to 1.73.0.
- [Release notes](https://github.com/googleapis/python-genai/releases)
- [Changelog](https://github.com/googleapis/python-genai/blob/main/CHANGELOG.md)
- [Commits](googleapis/python-genai@v1.72.0...v1.73.0)

---
updated-dependencies:
- dependency-name: google-genai
  dependency-version: 1.73.0
  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

@@ -20,7 +20,7 @@ opentelemetry-exporter-otlp-proto-grpc==1.41.0
 opentelemetry-exporter-otlp-proto-http==1.41.0
 playwright==1.58.0
 # Primary LLM provider (Gemini-first).
-google-genai==1.72.0
+google-genai==1.73.0
 # Optional provider accelerator (enabled via OPENVIBECODING_PROVIDER_USE_LITELLM=1).
 # Keep this path optional at runtime; do not block baseline bootstrap/clean-room
 # recovery on a provider accelerator that is activated only behind an env flag.

apps/orchestrator/setup.cfg

@@ -31,7 +31,7 @@ install_requires =
     opentelemetry-exporter-otlp-proto-grpc==1.41.0
     opentelemetry-exporter-otlp-proto-http==1.41.0
     playwright==1.58.0
-    google-genai==1.72.0
+    google-genai==1.73.0
     openai-agents==0.13.6
     temporalio==1.22.0
     duckduckgo-search==8.1.1