Fix unknown values in version

[remyleone]

Command attempted

$ scw version
Version          2.41.0
BuildDate        unknown
GoVersion        go1.24.4
GitBranch        unknown
GitCommit        unknown
GoArch           arm64
GoOS             darwin
UserAgentPrefix  scaleway-cli

Expected Behavior

We have unknown values

Actual Behavior

We should not have unknown values.

More info