Bump anyio from 3.3.4 to 3.4.0 (#1139)

Bumps [anyio](https://github.com/agronholm/anyio) from 3.3.4 to 3.4.0.
- [Release notes](https://github.com/agronholm/anyio/releases)
- [Changelog](https://github.com/agronholm/anyio/blob/master/docs/versionhistory.rst)
- [Commits](agronholm/anyio@3.3.4...3.4.0)

---
updated-dependencies:
- dependency-name: anyio
  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

@@ -59,7 +59,7 @@ python = "^3.7"
 typing-extensions = "^3.7"
 
 [tool.poetry.dev-dependencies]
-anyio = "^3.3"
+anyio = "^3.4"
 curio = "^1.5"
 trio = "^0.19"
 attrs = "^21.2"