Pin the golang version in the brew recipe

[mstoykov]

Currently, the brew recipe just builds k6 with the latest go in brew.

We in generally do not update the go version exactly after it comes out as it usually has performance changes and sometimes even small brekaing changes for us(usually in tests).

In the past we also had had a couple of cases of changes in having significant changes on how k6 operates so it's not always just "bump the version" kind of change.

Every other official package has the version pinned except brew which makes little to no senses and makes thigns such as #2474 (comment) harder to diagnose for users.

While we can't do anything about every non official package we can at least make it work for the ones we control.

[na--]

👍 , but I am not sure something like that will be accepted or if it's even possible. Generally, if they can, I think package maintainers try to use only a single compiler version for all packages with the same language in their repository 🤔

[mstoykov]

I tried to get this to happen and while the homebrew formula language allows this, the project as a whole is against:

1. pinning to dependancies , unless newer versions actually break it
2. building from binaries

Given this I guess we will cross our fingers and point to that PR if anyone ever hits this again.