Tidy up deprecation warnings in goreleaser

[jhiemstrawisc]

It looks like we use a deprecated config snapshot.name_template: https://goreleaser.com/deprecations/#snapshotname_template.

I also regularly see this error:

 only configurations files on  version: 2  are supported, yours is  version: 0 , please update your configuration

The fix appears to be pinning version: 2. I tested this by adding the key at the beginning of goreleaser:

project_name: pelican
version: 2

Let's also update/pin our goreleaser version (unless there's a good reason not to)