fix: fix var name for commit hash used for version subcommand

[rinx]

I found that regal version subcommand does not show commit hash.

❯ ./regal version             
Version:    0.27.0
Go Version: go1.22.5
Platform:   linux/amd64
Commit:     unknown
Timestamp:  2024-09-17T15:00:44Z
Hostname:   github.actions.local

This is because the build time information is passed to pkg/version.Commit variable, but it does not exist there.

regal/.goreleaser.yaml

Line 24 in e205cd9

- -X github.com/styrainc/regal/pkg/version.Commit={{ .Commit }}

I fixed this problem by renaming pkg/version.Vcs to pkg/version.Commit.

❯ go build -ldflags='-X github.com/styrainc/regal/pkg/version.Commit=my-commit'

❯ ./regal version
Version:    unknown
Go Version: go1.22.7
Platform:   linux/amd64
Commit:     my-commit
Timestamp:  unknown
Hostname:   unknown

[srenatus]

Thanks