build(dashmate): update Tenderdash image to v1.6.0

[Claudius-Maginificent]

Why this PR exists

• Problem: dashmate pinned an older Tenderdash image (1.6-dev.1). We are moving dashmate to the Tenderdash 1.6.0 line.
• What breaks without it: nodes provisioned by dashmate keep running an outdated Tenderdash build, missing the 1.6.0 changes.
• Note: This PR currently pins the 1.6.0-dev.2 pre-release image so the 1.6.0 line can be tested end-to-end. It will be bumped to the final 1.6.0 image once that release is cut and testing passes — kept as a draft until then.

Issue being fixed or feature implemented

Move dashmate's default Tenderdash image to the 1.6.0 line. The base config previously pinned dashpay/tenderdash:1.6-dev.1; without this, dashmate-provisioned nodes stay on an outdated Tenderdash build.

What was done?

• Bumped the default Tenderdash image in packages/dashmate/configs/defaults/getBaseConfigFactory.js to dashpay/tenderdash:1.6.0-dev.2.
• Added a config migration (4.0.0-rc.2) in packages/dashmate/configs/getConfigFileMigrationsFactory.js so existing user configs upgrade to the new image on dashmate update (pulled DRY from the base config, so it tracks whatever the base config pins).

How Has This Been Tested?

• Confirmed dashpay/tenderdash:1.6.0-dev.2 is published on Docker Hub (multi-arch amd64/arm64).
• yarn workspace dashmate lint → 0 errors.

Breaking Changes

• None.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed
• Pin final 1.6.0 image (pending the final release + testing)

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

_{🤖 Co-authored by Claudius the Magnificent AI Agent}

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