Support for Python 3.10

In v7 you removed support for Python 3.8, 3.9 and 3.10. But 3.10 [isn't EOL for another 9 months](https://endoflife.date/python).

I'd like to use morecantile in async-geotiff which I'd like to use in Lonboard. I've had a general opinion that in Lonboard I only remove support for Python versions once they're EOL (unless I have a strong reason from a dependency; I know some scientific dependencies deprecate Python versions faster).

But in this case, judging by the `pyproject.toml` of:

- pyproj >= 3.1
- pydantic >= 2
- click
- rasterio >= 1.2

It doesn't seem that there's any blocker to still supporting 3.10? In that case, it might be nice to support 3.10 up until EOL or until there's a point where it's truly annoying to support 3.10