chore(dashmate): update Core to 21.2 nightly

[shumkov]

Issue being fixed or feature implemented

Update Core to latest nightly to ensure compatibility with Platform

What was done?

• Updated Core to v21.2.0-nightly.2024.09.04
• Added config migration

How Has This Been Tested?

None

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

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

[QuantumExplorer]

Do not merge this!

[shumkov]

@QuantumExplorer what about now?

[QuantumExplorer]

Let's make this for 1.4 only please.