Update dependency melos to v7.0.0-dev.8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
melos (source)	dev_dependencies	patch	7.0.0-dev.7 -> 7.0.0-dev.8

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Release Notes

invertase/melos (melos)

v7.0.0-dev.8

• FIX: Fail early on steps and return error code (#​891). (7161ce8f)
• DOCS: add jaspr to projects (#​881). (926b6215)
• DOCS: Add Stac to the list of projects using Melos. (#​864). (8838863e)

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Configuration

📅 Schedule: Branch creation - "after 10pm every weekend,every weekend,before 5am every weekend" in timezone Asia/Tokyo, Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, check this box

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: pubspec.lock

Command failed: dart pub upgrade melos
Because Gynx requires the Flutter SDK, version solving failed.

Flutter users should use `flutter pub` instead of `dart pub`.