poetry export does not support typing-extensions 4.7.0

[ilaner]

I'm getting the following message when running poetry export:

The `typing-extensions` package has the following compatible candidates `[Package('typing-extensions', '4.6.3')]`;  but, the exporter dependency walker previously elected `typing-extensions (4.7.0)` which is not compatible with the dependency `typing-extensions (>=4.6.0,<4.7.0)`. Please contribute to `poetry-plugin-export` to solve this problem.

When changing the pyproject.toml dependency to typing-extensions = "^4.1.1,<4.7", it works as planned.

[dimbleby]

duplicate #168, #176, #183, #186, #187, etc