Add upper limit to pyflake's version <3.0 (#186)

The latest pyflake version removed handling of python 2.x ``# type:`` comments.
It would be very convenient to have a last release that support it in autoflake. 

As the dependency was not upper limited none of the current release of autoflake handle's 2.X style typing.

pyproject.toml

@@ -17,7 +17,7 @@ classifiers = [
 keywords = ["clean", "fix", "automatic", "unused", "import"]
 urls = { Homepage = "https://www.github.com/PyCQA/autoflake" }
 requires-python = ">=3.7"
-dependencies = ["pyflakes>=1.1.0", "tomli>=2.0.1;python_version<'3.11'"]
+dependencies = ["pyflakes>=1.1.0,<3", "tomli>=2.0.1;python_version<'3.11'"]
 dynamic = ["version"]
 
 [project.readme]