Feature/update reqs pin polars

[paulf81]

Ready to be merged

Feature or improvement description This pull request implements two small changes to the requirements:

• Changes dependent versioning to use latest compatible version (semantic versioning) [Issue #139]
• Reinforces that we're back-pinning polars until we agree on general [Issue #133 ]

Except for polars, requirements specified via ~=1.1, which is interpreted as >=1.1, ==1.*, which essentially means latest minor version which matches major version, and is >= minor version specified. Can see:

https://packaging.python.org/en/latest/specifications/version-specifiers/#id4

Related issue, if one exists Closes #139 Issue #133

Impacted areas of the software setup.py

[paulf81]

Note that this is PR is currently pointing to merge into NREL:main, which I think is what you intended because it's a bug fix, but just checking

Thanks @misi9170 ! That's right, plan was to merge into main and then back merge this change to develop, I'll do it now...