[5.3] Deprecate namespace property of ComponentRecord (#44754)

* Deprecate namespace property of ComponentRecord

* Update libraries/src/Component/ComponentRecord.php

Co-authored-by: Allon Moritz <[email protected]>

---------

Co-authored-by: Allon Moritz <[email protected]>
Co-authored-by: Quy Ton <[email protected]>

Author: 3 people

libraries/src/Component/ComponentRecord.php

@@ -52,6 +52,8 @@ class ComponentRecord
      *
      * @var    string
      * @since  4.0.0
+     *
+     * @deprecated  __DEPLOY_VERSION__ will be removed in 7.0 as it was never used
      */
     public $namespace;