chore: rename snyk2Spdx > snyk2spdx

[lili2311]

• [ ] Tests written and linted ℹ︎
• [ ] Documentation written in Wiki/README
• [ ] Commit history is tidy & follows Contributing guidelines ℹ︎

What this does

Rename across all files snyk2Spdx => snyk2spdx

[aarlaud]

:tada: This PR is included in version 1.0.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: