Do not hard code version

[sluongng]

I suggest to make the actual version and SHA256 of the binaries (i.e. golangci-lint) to be customizable for downstream repo to source from this repo directly.

Otherwise downstream repos will have to copy paste the code you have here and customize the version themselves.

[ash2k]

If you want a more up to date version you are welcome to send a PR :)

[sluongng]

Not just the versioning, but sometimes we might want to use internal fork/mirror to download as well