chore: testnet: update genesis network version for dev testnets

[jennijuju]

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Before you mark the PR ready for review, please make sure that:

• Commits have a clear commit message.
• PR title is in the form of of <PR type>: <area>: <change being made>
  • example: fix: mempool: Introduce a cache for valid signatures
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• Tests exist for new functionality or change in behavior
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[github-actions]

All checks have passed

[jennijuju]

targetted this branch as the changes are not too useful for master users