Bump trio from 0.30.0 to 0.31.0

Bumps [trio](https://github.com/python-trio/trio) from 0.30.0 to 0.31.0.
- [Release notes](https://github.com/python-trio/trio/releases)
- [Commits](python-trio/trio@v0.30.0...v0.31.0)

---
updated-dependencies:
- dependency-name: trio
  dependency-version: 0.31.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -57,7 +57,7 @@ sortedcontainers==2.4.0
 statsd==4.0.1
 sqlparse==0.5.0
 tqdm==4.67.0
-trio==0.30.0
+trio==0.31.0
 trio-websocket==0.12.1
 Twisted==25.5.0
 txaio==25.6.1