deps(deps): bump @google/genai from 1.51.0 to 2.4.0

Bumps [@google/genai](https://github.com/googleapis/js-genai) from 1.51.0 to 2.4.0.
- [Release notes](https://github.com/googleapis/js-genai/releases)
- [Changelog](https://github.com/googleapis/js-genai/blob/main/CHANGELOG.md)
- [Commits](googleapis/js-genai@v1.51.0...v2.4.0)

---
updated-dependencies:
- dependency-name: "@google/genai"
  dependency-version: 2.4.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package.json

@@ -97,7 +97,7 @@
     "@anthropic-ai/claude-agent-sdk": "^0.3.143",
     "@anthropic-ai/sdk": "^0.96.0",
     "@github/copilot-sdk": "^0.3.0",
-    "@google/genai": "^1.51.0",
+    "@google/genai": "^2.4.0",
     "@mistralai/mistralai": "^2.2.1",
     "@modelcontextprotocol/sdk": "^1.29.0",
     "@openai/codex-sdk": "^0.130.0",