Fix config.GetSemverInfo() for Go 1.18

In Go 1.18 debug.ReadBuildInfo() may successfully return a build
info where the main version is empty. Return the default SemVer
in this case.

pkg/config/config.go

@@ -14,7 +14,7 @@ func GetSemverInfo() string {
 		return SemVer
 	}
 	version, ok := debug.ReadBuildInfo()
-	if ok && version.Main.Version != "(devel)" {
+	if ok && version.Main.Version != "(devel)" && version.Main.Version != "" {
 		return version.Main.Version
 	}
 	return _defaultSemVer