Update agent-framework-devui requirement (#61)

Updates the requirements on [agent-framework-devui](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-devui
  dependency-version: 1.0.0b260428
  dependency-type: direct:development
...

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Author: dependabot[bot]

pyproject.toml

@@ -48,7 +48,7 @@ agent-framework = [
     "hyperlight-sandbox-python-guest",
 ]
 agent-framework-devui = [
-    "agent-framework-devui>=1.0.0b260421",
+    "agent-framework-devui>=1.0.0b260428",
 ]
 
 [tool.ruff]