fix: update namespace value for OpenSUSE distros (#3615)

Instead of namespacing them to the specific distro version, such as
Leap or Tumbleweed, the namespace value is set to the vendor itself:
"opensuse".

Resolves #3534

Signed-off-by: Martin Prpič <mprpic@redhat.com>

syft/pkg/cataloger/redhat/package.go

@@ -92,6 +92,9 @@ func packageURL(name, arch string, epoch *int, srpm string, version, release str
 	if namespace == "rhel" {
 		namespace = "redhat"
 	}
+	if strings.HasPrefix(namespace, "opensuse") {
+		namespace = "opensuse"
+	}
 
 	qualifiers := map[string]string{}