Contract verification non-detemenistic test

[vbaranov]

This non-detemenistic test is failing in almost all first runs of CI for each PR. It slows down PRs merging to master branch.

  2) test verification with nightly builds verification is failed if wrong nightly version of compiler ~0.5.11 (Explorer.SmartContract.Solidity.VerifierTest)
Error:      test/explorer/smart_contract/solidity/verifier_test.exs:760
     match (=) failed
     code:  assert {:error, :compiler_version} = response
     left:  {:error, :compiler_version}
     right: {:ok,
             %{
               abi: [
                 %{
                   "constant" => true,
                   "inputs" => [],
                   "name" => "lastSender",
                   "outputs" => [
                     %{
                       "internalType" => "address",
                       "name" => "",
                       "type" => "address"
                     }
                   ],
                   "payable" => false,
                   "stateMutability" => "view",
                   "type" => "function"
                 },
                 %{
                   "constant" => true,
                   "inputs" => [],
                   "name" => "value",
                   "outputs" => [
                     %{
                       "internalType" => "uint256",
                       "name" => "",
                       "type" => "uint256"
                     }
                   ],
                   "payable" => false,
                   "stateMutability" => "view",
                   "type" => "function"
                 },
                 %{
                   "constant" => false,
                   "inputs" => [
                     %{
                       "internalType" => "uint256",
                       "name" => "delta",
                       "type" => "uint256"
                     }
                   ],
                   "name" => "inc",
                   "outputs" => [],
                   "payable" => false,
                   "stateMutability" => "nonpayable",
                   "type" => "function"
                 },
                 %{
                   "inputs" => [
                     %{
                       "internalType" => "uint256",
                       "name" => "initialValue",
                       "type" => "uint256"
                     }
                   ],
                   "payable" => false,
                   "stateMutability" => "nonpayable",
                   "type" => "constructor"
                 },
                 %{
                   "anonymous" => false,
                   "inputs" => [
                     %{
                       "indexed" => true,
                       "internalType" => "address",
                       "name" => "sender",
                       "type" => "address"
                     },
                     %{
                       "indexed" => false,
                       "internalType" => "uint256",
                       "name" => "newValue",
                       "type" => "uint256"
                     }
                   ],
                   "name" => "Incremented",
                   "type" => "event"
                 }
               ]
             }}
     stacktrace:
       test/explorer/smart_contract/solidity/verifier_test.exs:785: (test)