ci: Fix typo in forc-unit tests

[sdankel]

Description

This typo was introduced here: 5e24673#diff-b803fcb7f17ed9235f1e5cb1fcd2f5d3b2838429d4368ae4c57ce4436577f03fR465

& should be &&

It caused the exit code to be 0 even though some of the tests fails to compile. Example: https://github.com/FuelLabs/sway/actions/runs/10865968373/job/30152989834#step:6:86

Thanks @alfiedotwtf for noticing these failing tests!

Checklist

• I have linked to any relevant issues.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation where relevant (API docs, the reference, and the Sway book).
  • If my change requires substantial documentation changes, I have requested support from the DevRel team
• I have added tests that prove my fix is effective or that my feature works.
• I have added (or requested a maintainer to add) the necessary Breaking* or New Feature labels where relevant.
• I have done my best to ensure that my PR adheres to the Fuel Labs Code Review Standards.
• I have requested a review from the relevant team or maintainers.

[kayagokalp]

🚀 , nice catch!