The mainnet has been upgraded to the Node v28

https://github.com/3Dpass/3DP/releases/tag/v28

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The upgrade description:

Validator set
- The `addSelf` method for Validator-candidates to join by themselves:
   - 10 000 P3D set up fee goes to Treasury
   - No block authorship requirements
- The Validator-candidates queue for both joining and rejoining ones:
   - Limit: 1 validator per session is allowed into the set
   - Council vote can bypass the queue
   - On-chain Identity min requirements: Reasonable


3DPRC-2
- The object max size is expanded to 1 Mb
- Estimation time limit is expanded to 30 sec
- Private/Public tag on putObject
- Minor fixes: https://github.com/3Dpass/3DP/issues/88

Identity
- The `suspend` and `resume` methods for registrars. Registrars can be suspended/resumed by the Council vote.