fix(testutil): fix FreeTCPAddr localhost usage

[gluax]

Description

Closes: #18992

Makes the change in the FreeTCPAddr to check if the port is free on 127.0.0.1 since localhost is not always equal to that IP as a standard.
Should not affect any systems where localhost is equal to that IP. Would only fix it for systems where that is not the case.

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[coderabbitai]

Walkthrough

The change involves updating the FreeTCPAddr function within the testutil/network/util.go file. The modification switches the binding address from "localhost" to "127.0.0.1". This adjustment aims to resolve a binding issue that occurs when running commands from a node in Windows Subsystem for Linux (WSL) with the cosmos SDK, which was causing a panic error.

Changes

File	Change Summary
testutil/network/util.go	Changed address from "localhost" to "127.0.0.1" in FreeTCPAddr function.

Assessment against linked issues

Objective	Addressed	Explanation
Avoid using the keyword localhost and replace it with 127.0.0.1 in testutil to fix binding issues in WSL (#18992)	✅
Ensure code changes are compatible with Cosmos SDK version 0.50.* (#18992)	❓	The compatibility with Cosmos SDK version 0.50.* cannot be determined from the provided summary alone. Additional context or code review would be necessary to confirm.

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[gluax]

I don't think additional testing is relevant, nor would I be sure how to make a CI test for one of those environments. That being said, I have tested these changes in WSL, which is such a system, and it now works instead of panicking :). I could attach a before and after screenshot if desired.

As far as the entry changelog, I could write something similar, but shorter, for the changelog if desired. Or is this a simple enough PR that this doesn't require that?

[facundomedica]

LGTM, thank you!

[julienrbrt]

@Mergifyio backport release/v0.50.x

[mergify]

backport release/v0.50.x

✅ Backports have been created

• #18999 fix(testutil): fix FreeTCPAddr localhost usage (backport #18996) has been created for branch release/v0.50.x