Build with GO 1.19.8

[carolynvs]

What does this change

Build with the most recent patch release for Go 1.19. Earlier versions have vulnerabilities that are being flagged in IronBank.

What issue does it fix

Ensures that our porter-agent image in IronBank does not have any vulnerabilities reported.

Notes for the reviewer

N/A

Checklist

• Did you write tests?
• Did you write documentation?
• Did you change porter.yaml or a storage document record? Update the corresponding schema file.
• If this is your first pull request, please add your name to the bottom of our Contributors list. Thank you for making Porter better! 🙇‍♀️

Reviewer Checklist

• Comment with /azp run test-porter-release if a magefile or build script was modified
• Comment with /azp run porter-integration if it's a non-trivial PR