feat(dashmate): update core version to 20.0.1

[pshenmic]

Issue being fixed or feature implemented

Upgrade core version to 20.0.1 and update genesis to dash-testnet-26

What was done?

• Updated core version
• Updated testnet platform genesis to dash-testnet-26

How Has This Been Tested?

Locally

Breaking Changes

No

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