package/python-pyyaml: security bump to version 5.4.1

package/python-pyyaml: security bump to version 5.4.1

Fix CVE-2020-14343: A vulnerability was discovered in the PyYAML library
in versions before 5.4, where it is susceptible to arbitrary code
execution when it processes untrusted YAML files through the full_load
method or with the FullLoader loader. Applications that use the library
to process untrusted input may be vulnerable to this flaw. This flaw
allows an attacker to execute arbitrary code on the system by abusing
the python/object/new constructor. This flaw is due to an incomplete fix
for CVE-2020-1747.

Update hash of LICENSE file (update in year:
https://github.com/yaml/pyyaml/commit/58d0cb7ee09954c67fabfbd714c5673b03e7a9e1)

https://github.com/yaml/pyyaml/blob/5.4.1/CHANGES

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