package/refpolicy: fix REFPOLICY_CPE_ID_VENDOR

package/refpolicy: fix REFPOLICY_CPE_ID_VENDOR

cpe:2.3:a:selinuxproject:refpolicy is a valid CPE identifier for this
package:

  https://nvd.nist.gov/products/cpe/search/results?namingFormat=2.3&keyword=cpe%3A2.3%3Aa%3Aselinuxproject%3Arefpolicy

Indeed, cpe:2.3:a:tresys:refpolicy has been deprecated since April 21th:

  <cpe-item name="cpe:/a:tresys:refpolicy:2.20180701" deprecated="true" deprecation_date="2021-04-21T16:55:43.710Z">
    <title xml:lang="en-US">Tresys refpolicy 2.20180701</title>
      <reference href="https://github.com/TresysTechnology/refpolicy">Product</reference>
    <cpe-23:cpe23-item name="cpe:2.3:a:tresys:refpolicy:2.20180701:*:*:*:*:*:*:*">
        <cpe-23:deprecated-by name="cpe:2.3:a:selinuxproject:refpolicy:2.20180701:*:*:*:*:*:*:*" type="NAME_CORRECTION"/>

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>