Update aiofiles requirement from >=23.2.0 to >=25.1.0 in /src

Updates the requirements on [aiofiles](https://github.com/Tinche/aiofiles) to permit the latest version.
- [Release notes](https://github.com/Tinche/aiofiles/releases)
- [Changelog](https://github.com/Tinche/aiofiles/blob/main/CHANGELOG.md)
- [Commits](Tinche/aiofiles@v23.2.0...v25.1.0)

---
updated-dependencies:
- dependency-name: aiofiles
  dependency-version: 25.1.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

src/a2a/requirements_a2a.txt

@@ -1,8 +1,8 @@
-fastapi>=0.104.0
+fastapi>=0.104.0
 uvicorn[standard]>=0.24.0
 starlette>=0.27.0
 pydantic>=2.5.0
-aiofiles>=23.2.0
+aiofiles>=25.1.0
 httpx>=0.25.0
 psutil>=5.9.0
 prometheus-client>=0.19.0