fix: expected service to be a string with ip address and port

[shumkov]

Issue being fixed or feature implemented

[12:20:11.610] ERROR (35): Invalid Argument: Expected service to be a string with ip address and port
Error
    at new NodeError (/platform/.yarn/cache/@dashevo-dashcore-lib-npm-0.21.2-db85f9aff6-61e640fd3d.zip/node_modules/@dashevo/dashcore-lib/lib/errors/index.js:23:40)
    at Object.checkArgument (/platform/.yarn/cache/@dashevo-dashcore-lib-npm-0.21.2-db85f9aff6-61e640fd3d.zip/node_modules/@dashevo/dashcore-lib/lib/util/preconditions.js:17:13)
    at SimplifiedMNListEntry.validate (/platform/.yarn/cache/@dashevo-dashcore-lib-npm-0.21.2-db85f9aff6-61e640fd3d.zip/node_modules/@dashevo/dashcore-lib/lib/deterministicmnlist/SimplifiedMNListEntry.js:204:7)
    at Function.fromObject (/platform/.yarn/cache/@dashevo-dashcore-lib-npm-0.21.2-db85f9aff6-61e640fd3d.zip/node_modules/@dashevo/dashcore-lib/lib/deterministicmnlist/SimplifiedMNListEntry.js:189:12)
    at new SimplifiedMNListEntry (/platform/.yarn/cache/@dashevo-dashcore-lib-npm-0.21.2-db85f9aff6-61e640fd3d.zip/node_modules/@dashevo/dashcore-lib/lib/deterministicmnlist/SimplifiedMNListEntry.js:72:36)
    at /platform/.yarn/cache/@dashevo-dashcore-lib-npm-0.21.2-db85f9aff6-61e640fd3d.zip/node_modules/@dashevo/dashcore-lib/lib/deterministicmnlist/SimplifiedMNListDiff.js:222:16
    at Array.map (<anonymous>)
    at Function.fromObject (/platform/.yarn/cache/@dashevo-dashcore-lib-npm-0.21.2-db85f9aff6-61e640fd3d.zip/node_modules/@dashevo/dashcore-lib/lib/deterministicmnlist/SimplifiedMNListDiff.js:221:44)
    at new SimplifiedMNListDiff (/platform/.yarn/cache/@dashevo-dashcore-lib-npm-0.21.2-db85f9aff6-61e640fd3d.zip/node_modules/@dashevo/dashcore-lib/lib/deterministicmnlist/SimplifiedMNListDiff.js:41:35)
    at MasternodeListSync.sync (/platform/packages/dapi/lib/MasternodeListSync.js:82:22)

What was done?

• Fixed service IP handling fix: unknown empty service IP dashcore-lib#299
• Updated core version to v21.0.0-rc.2
• Updated testnet genesis to allow connect a dashmate node

How Has This Been Tested?

Running a testnet node locally

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