mismatched nonce in TestSwapFactory_NewSwap and TestSwap_Refund_afterT1
I'm trying to get up-to-speed on the code base.  One of the first things I tried was the `./scripts/run-unit-tests.sh` script called by `make test`.

```
=== RUN   TestSwapFactory_NewSwap
    swap_factory_test.go:41: gas cost to deploy SwapFactory.sol: 782308
    swap_factory_test.go:46: 
        	Error Trace:	swap_factory_test.go:46
        	Error:      	Received unexpected error:
        	            	the tx doesn't have the correct nonce. account has nonce of: 3 tx has nonce of: 2
        	Test:       	TestSwapFactory_NewSwap
```

```
=== RUN   TestSwap_Refund_afterT1
    swap_factory_test.go:272: gas cost to deploy SwapFactory.sol: 782308
    swap_factory_test.go:277: 
            Error Trace:    swap_factory_test.go:277
            Error:          Received unexpected error:
                            the tx doesn't have the correct nonce. account has nonce of: 20 tx has nonce of: 19
            Test:           TestSwap_Refund_afterT1
--- FAIL: TestSwap_Refund_afterT1 (0.95s)
```
Is this a known issue?  Is there any other information I can provide?

I'm on Ubuntu 22.04:
```
$ go version
go version go1.18.3 linux/amd64

$ /usr/local/bin/ganache-cli --version
Ganache CLI v6.12.2 (ganache-core: 2.13.2)
```
