Ensure inspec-core gem depends on rubocop-ast

[kellinm]

Ensure inspec gem depends on rubocop-ast

- Adds `rubocop-ast` to the gemspec file because it was added as a requirement in commit b5fcc141d2.  Without this addition, the inspec gem will exhibit runtime failures because this gem was not installed.

Obvious fix.

Description

When installing inspec-core, the recently introduced dependency on rubocop-ast is missed causing runtime failures.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New content (non-breaking change)
• Breaking change (a content change which would break existing functionality or processes)

Checklist:

• I have read the CONTRIBUTING document.

[netlify]

✅ Deploy Preview for chef-inspec canceled.

Name	Link
🔨 Latest commit	cbc0bc0
🔍 Latest deploy log	https://app.netlify.com/sites/chef-inspec/deploys/65b2b2889fdacc00085acb30

[chef-expeditor]

Hello kellinm! Thanks for the pull request!

Here is what will happen next:

1. Your PR will be reviewed by the maintainers.
2. Possible Outcomes
   a. If everything looks good, one of them will approve it, and your PR will be merged.
   b. The maintainer may request follow-on work (e.g. code fix, linting, etc). We would encourage you to address this work in 2-3 business days to keep the conversation going and to get your contribution in sooner.
   c. Cases exist where a PR is neither aligned to Chef InSpec's product roadmap, or something the team can own or maintain long-term. In these cases, the maintainer will provide justification and close out the PR.

Thank you for contributing!

[kellinm]

@clintoncwolfe - just wanted to check in and see if you need anything else from me for the review process.

The two failing jobs are not marked required - and I do not have access to check on them to see what failed.

[Vasu1105]

This looks good to me @kellinm. Could you please rebase your branch?

[kellinm]

Thank you @Vasu1105 , I have rebased as well as amended my commit message title to match the changed message from maintainer.