fix(oscal): update version of assessment results generated

[brandtkeller]

Description

Noticed the assessment-results object output from validate was not version 1.1.3 due to a constant we have defined. Bumping this version to match intended version.

Related Issue

No issue - noticed a part of the workflow missing update from the transition to OSCAL 1.1.3 artifacts.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Other (security config, docs update, etc)

Checklist before merging

• Test, docs, adr added or updated as needed
• Schema Updates applied
• Contributor Guide Steps followed

[meganwolf0]

I see a latestVersion const in go-oscal - wonder if it might make sense to make that public instead and use that in the future?

[brandtkeller]

I see a latestVersion const in go-oscal - wonder if it might make sense to make that public instead and use that in the future?

Worth consideration - It would remove potential drift when updating - but also remove some inherent control that a consumer of the library has over updating the dependency with additional plan to work through some supporting behaviors before consuming the type updates.