[1104] Increase Mystique activation block numbers in all networks

[diega]

This PR proposes the following changes:

• Given that the proposed Mordor block for activating Mystique already passed, and to give the community enough time to update their clients, the following new block numbers are proposed
  • Mordor (488723 seconds until Jan 13th 2022): 5_479_462 block + 487_261 secs / 12 secs/block ~= 5_520_000 block
  • Kotti (1352603 seconds until Jan 23rd 2022): 5_487_158 block + 1_351_173 secs / 15 secs/block ~= 5_578_000 block
  • Mainnet (3166978 seconds until Feb 13th 2022): 14_285_039 block + 3_165_459 secs / 13.2 secs/block ~= 14_525_000 block

Ref: discussion #440

[ziogaschr]

LGTM