package/python-keyring: add CPE variables

cpe:2.3:a:python:keyring is a valid CPE identifier for this package:

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

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

package/python-keyring/python-keyring.mk

@@ -10,6 +10,8 @@ PYTHON_KEYRING_SITE = https://files.pythonhosted.org/packages/ee/46/77fdb7cd2b0f
 PYTHON_KEYRING_SETUP_TYPE = setuptools
 PYTHON_KEYRING_LICENSE = MIT
 PYTHON_KEYRING_LICENSE_FILES = LICENSE
+PYTHON_KEYRING_CPE_ID_VENDOR = python
+PYTHON_KEYRING_CPE_ID_PRODUCT = keyring
 PYTHON_KEYRING_DEPENDENCIES = host-python-setuptools-scm
 
 $(eval $(python-package))