Fix(bbl-up): Use correct flags for new `yq` CLI

[ctlong]

What is this change about?

Fix failures in bbl-up task in CI by using the correct flags for the new yq CLI.

Please provide contextual information.

• https://concourse.wg-ard.ci.cloudfoundry.org/teams/main/pipelines/update-releases/jobs/update-stemcell-minor/builds/21

• 167

Please check all that apply for this PR:

• [ ] introduces a new task
• [x] changes an existing task
• [ ] changes the Dockerfile
• [ ] introduces a breaking change (other users will need to make manual changes when this is released)

Did you update the README as appropriate for this change?

• [ ] YES
• [x] N/A

What is the level of urgency for publishing this change?

• [x] Urgent - unblocks current or future work
• [ ] Slightly Less than Urgent

Tag your pair, your PM, and/or team!

N/A