Bump anyio from 2.2.0 to 3.0.0

Bumps [anyio](https://github.com/agronholm/anyio) from 2.2.0 to 3.0.0.
- [Release notes](https://github.com/agronholm/anyio/releases)
- [Changelog](https://github.com/agronholm/anyio/blob/master/docs/versionhistory.rst)
- [Commits](agronholm/anyio@2.2.0...3.0.0)

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

Author: dependabot-preview[bot]

poetry.lock

@@ -59,7 +59,7 @@ python = "^3.7"
 typing-extensions = "^3.7"
 
 [tool.poetry.dev-dependencies]
-anyio = "^2.2"
+anyio = "^3.0"
 curio = "^1.5"
 trio = "^0.18"
 attrs = "^20.3"