Update agent-framework-github-copilot requirement (#100)

Updates the requirements on [agent-framework-github-copilot](https://github.com/microsoft/agent-framework) to permit the latest version.
- [Release notes](https://github.com/microsoft/agent-framework/releases)
- [Commits](https://github.com/microsoft/agent-framework/commits)

---
updated-dependencies:
- dependency-name: agent-framework-github-copilot
  dependency-version: 1.0.0b260521
  dependency-type: direct:development
...

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pyproject.toml

@@ -42,7 +42,7 @@ copilot-sdk = [
     "hyperlight-sandbox-python-guest",
 ]
 agent-framework = [
-    "agent-framework-github-copilot>=1.0.0b260429",
+    "agent-framework-github-copilot>=1.0.0b260521",
     "pydantic",
     "hyperlight-sandbox",
     "hyperlight-sandbox-backend-wasm",