Bump trio from 0.30.0 to 0.31.0 (#2245)

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:development
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

poetry.lock

@@ -56,7 +56,7 @@ mypy = { version = ">=1.12,<1.18", optional = true }
 
 [tool.poetry.group.dev.dependencies]
 anyio = "^4.3"
-trio = "^0.30"
+trio = ">=0.30,<0.32"
 attrs = "^25.3"
 httpx = "^0.28"