Update flask requirement from 2.2.5 to 3.0.0

Updates the requirements on [flask](https://github.com/pallets/flask) to permit the latest version.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@2.2.5...3.0.0)

---
updated-dependencies:
- dependency-name: flask
  dependency-type: direct:development
...

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

pyproject.toml

@@ -64,7 +64,7 @@ mypy = "==0.910"
 optional = true
 
 [tool.poetry.group.contract-tests.dependencies]
-Flask = "2.2.5"
+Flask = "3.0.0"
 requests = ">=2.31.0"
 urllib3 = ">=1.22.0,<3"