Bump attrs from 24.2.0 to 25.3.0

Bumps [attrs](https://github.com/sponsors/hynek) from 24.2.0 to 25.3.0.
- [Commits](https://github.com/sponsors/hynek/commits)

---
updated-dependencies:
- dependency-name: attrs
  dependency-version: 25.3.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

app/backend/requirements.txt

@@ -22,7 +22,7 @@ asgiref==3.8.1
     # via opentelemetry-instrumentation-asgi
 async-timeout==5.0.1
     # via aiohttp
-attrs==24.2.0
+attrs==25.3.0
     # via aiohttp
 azure-ai-documentintelligence==1.0.0b4
     # via -r requirements.in