Dsdk

What's Changed
* Update 3.9 plus by jlubken in https://github.com/pennsignals/dsdk/pull/87
* Drop old pythons
* Update development and test dependencies
* Fix nbqa
* Update cfgenvy

**Full Changelog**: https://github.com/pennsignals/dsdk/compare/1.9.1...2.0.0-rc.1

What's Changed
* Update 3.9 plus by jlubken in https://github.com/pennsignals/dsdk/pull/87
* Drop old pythons
* Update development and test dependencies
* Fix nbqa
* Update cfgenvy

**Full Changelog**: https://github.com/pennsignals/dsdk/compare/1.9.1...2.0.0-rc.1

Pin blosc dependency.

What's Changed
* Add cache path and chunking by jlubken in https://github.com/pennsignals/dsdk/pull/84
* Move target to one line by mdbecker in https://github.com/pennsignals/dsdk/pull/85
* Improve test coverage by GrayEye in https://github.com/pennsignals/dsdk/pull/86


**Full Changelog**: https://github.com/pennsignals/dsdk/compare/1.8.1...1.9.0

No implicit Optional for mypy type checking.

Allow multiple kinds of flowsheets.