build(deps): Update structlog requirement in /packages/agent-mesh (microsoft#879)

Updates the requirements on [structlog](https://github.com/hynek/structlog) to permit the latest version.
- [Release notes](https://github.com/hynek/structlog/releases)
- [Changelog](https://github.com/hynek/structlog/blob/main/CHANGELOG.md)
- [Commits](hynek/structlog@24.1.0...25.5.0)

---
updated-dependencies:
- dependency-name: structlog
  dependency-version: 25.5.0
  dependency-type: direct:production
...

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Author: dependabot[bot]

packages/agent-mesh/pyproject.toml

@@ -52,7 +52,7 @@ dependencies = [
     "httpx>=0.27.0,<1.0",
     "aiohttp>=3.13.3,<4.0",
     "pyyaml>=6.0,<7.0",
-    "structlog>=24.1.0,<25.0",
+    "structlog>=24.1.0,<26.0",
     "click>=8.1.0,<9.0",
     "rich>=13.0.0,<14.0",
 ]