build: contract upgrade (#55)

* feat: change contracts version from `1.9.0` to `1.8.0`
* build: upgrade protocol smart contracts in Testnet
* build: prepare protocol smart contracts upgrade in Mainnet
* docs: change contracts version in comments 1.9.0 => 1.8.0
* Revert "docs: change contracts version in comments 1.9.0 => 1.8.0"
This reverts commit ec928ba.
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Co-authored-by: Evgenii Zaitsev <evgenii@cloudwalk.io>