Specify correct node version format in package.json

[xomaczar]

Description

Drop v prefix from node's version in package.json

Motivation and Context

Some tools (e.g. voltajs) does not recognize the node version format.

How Has This Been Tested?

N/A

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)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[escapedcat]

Thanks!