Fix runner in release workflow

[austin-denoble]

Problem

Was trying to run the new GitHub release action for the Go SDK and realized there's a misspelling in ubuntu-latest.

Solution

Fix runs-on to properly be ubuntu-latest.

Type of Change

• 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 not work as expected)
• This change requires a documentation update
• Infrastructure change (CI configs, etc)
• Non-code change (docs, etc)
• None of the above: (explain here)

Test Plan

N/A - rerun the workflow once this is merged

[aulorbe]

lol