fix: upgrade go-setup action to v3

[anujtewari]

Changes

• Upgrading go-setup action to v3 that has fix for Binaries installed via go install are not accessible on path  actions/setup-go#27

[adamdecaf]

The build still isn't seeing govulncheck installed. I think it's related to running from fork or something.

Can't find govulncheck...

[adamdecaf]

I'm going to look at actions/setup-go#259 for a fix. Thanks for bringing this up.

Edit: Other v2 usages are fine.
https://github.com/moov-io/watchman/runs/8234458303?check_suite_focus=true

starting govulncheck check
govulncheck is an experimental tool. Share feedback at https://go.dev/s/govulncheck-feedback.

Scanning for dependencies with known vulnerabilities...
No vulnerabilities found.
finished govulncheck check