Update flask requirement from <2.3,>=2.2 to >=2.2,<3.1

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@2.2.0...3.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

pyproject.toml

@@ -54,7 +54,7 @@ test = [
     "Pillow >=9.4.0, <10.1.0",
     "python-multipart ==0.0.6",
     "fastapi >=0.92, <0.104",
-    "Flask >=2.2, <2.3",
+    "Flask >=2.2, <3.1",
     "Flask-SQLAlchemy >=3.0,<3.2"
 ]
 doc = [