Skip undeterministic integration test (#1531)

* skip undeterministic integration test

* fix flake

* update gomod2nix

tests/integration_tests/test_gas.py

@@ -102,5 +102,4 @@ def test_block_gas_limit(ethermint):
         )
         (ethermint.w3.eth.wait_for_transaction_receipt(ethermint_txhash))
 
-
     return

tests/integration_tests/test_grpc_only.py

@@ -45,6 +45,9 @@ def grpc_eth_call(port: int, args: dict, chain_id=None, proposer_address=None):
     ).json()
 
 
+@pytest.mark.skip(
+    reason="undeterministic test - https://github.com/evmos/ethermint/issues/1530"
+)
 def test_grpc_mode(custom_ethermint):
     """
     - restart a fullnode in grpc-only mode