#241:issues with fbc v3

[fbergmann]

Description

in #241 matthias noticed a couple of inconsistencies.

• need to ensure correct package version is passed along
• the xmlns on the list of key value pairs is wrong.

Motivation and Context

fixes #241

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Change in documentation

Checklist:

• I have updated all documentation necessary.
• I have checked spelling in (new) comments.

Testing

• Testing is done automatically and codecov shows test coverage
• This cannot be tested automatically

[fbergmann]

i've confirmed that all issues are adressed, and working (here a colab book: https://colab.research.google.com/drive/1WTkKmnk8dbJ1NoMedlc91gitDdc2-P8U?usp=sharing) and corresponding python wheels for it. https://github.com/sbmlteam/python-libsbml/actions/runs/2675478034