.Net: Update release versions and VectorData readme

[westey-m]

Description

Update release versions and VectorData readme

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[roji]

Thanks, LGTM.

BTW we should also probably update the package READMEs for the providers themselves, to also make it clear these are implementations of MEVD and although they're provided by SK, they're not part of the SK (in the sense that they don't reference it/require it etc.).

[roji]

Looks perfect.