fix(tests): use 127.0.0.1 as an address for testing

[thehowl]

From @zivkovicmilos:

The test.go3 goblin seems to be back locally, as it always fails on my machine 🙃
The test that fails locally is this one, and I’ve found the culprit:

panic: failed to listen on 127.0.0.2:0: listen tcp 127.0.0.2:0: bind: can't assign requested address

goroutine 1 [running]:
github.com/gnolang/gno/pkgs/bft/rpc/test.StartTendermint({0x185a6f8, 0xc000388300}, {0x0, 0x0, 0x98?})
  /Users/zmilos/Work/gno/pkgs/bft/rpc/test/helpers.go:92 +0xff
github.com/gnolang/gno/pkgs/bft/rpc/client_test.TestMain(0x1041051?)
  /Users/zmilos/Work/gno/pkgs/bft/rpc/client/main_test.go:22 +0x5b
main.main()
  _testmain.go:97 +0x1d3
FAIL	github.com/gnolang/gno/pkgs/bft/rpc/client	1.235s

Changing these IPs to 127.0.0.1 instead of 127.0.0.2 solves the issue and the address binds without a problem when starting the Tendermint node
I have no idea why it won’t bind the 127.0.0.2 address on my local mac, since it should be a loopback address range 🤷‍♂️

[zivkovicmilos]

Time to slay this goblin ⚔️

[harry-hov]

LGTM 💯

Just a nitpick for PR title since it's going to be commit msg:

-fix(tests): don't use 127.0.0.2 as an address for testing
+fix(tests): use 127.0.0.1 as an address for testing