build(deps): update agent-manifest requirement in /examples (#310)

Updates the requirements on [agent-manifest](https://github.com/agentrust-io/agent-manifest) to permit the latest version.
- [Release notes](https://github.com/agentrust-io/agent-manifest/releases)
- [Changelog](https://github.com/agentrust-io/agent-manifest/blob/main/CHANGELOG.md)
- [Commits](agentrust-io/agent-manifest@python-v0.13.1...python-v0.15.0)

---
updated-dependencies:
- dependency-name: agent-manifest
  dependency-version: 0.15.0
  dependency-type: direct:production
...

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examples/industrial-embodied-ai/requirements.txt

@@ -1,4 +1,4 @@
-agent-manifest>=0.13.1
+agent-manifest>=0.15.0
 cmcp-runtime>=0.7.0
 cedarpy==4.12.1
 httpx>=0.28.1,<1