package/python{3}-requests: allow idna 3.x to be installed on python 3.x

package/python{3}-requests: allow idna 3.x to be installed on python 3.x

The tests.package.test_docker_compose.TestDockerCompose is broken
since the python-idna version bump to 3.0 because python-requests needs
python-idna < 3.0.

 # docker-compose up -d
 Traceback (most recent call last):
   File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 583, in _build_master
   File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 900, in require
   File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 791, in resolve
 pkg_resources.ContextualVersionConflict: (idna 3.2 (/usr/lib/python3.9/site-packages), Requirement.parse('idna<3,>=2.5'), {'requests'})

 During handling of the above exception, another exception occurred:

 Traceback (most recent call last):
   File "/usr/bin/docker-compose", line 6, in <module>
     from pkg_resources import load_entry_point
   File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 3252, in <module>
   File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 3235, in _call_aside
   File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 3264, in _initialize_master_working_set
   File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 585, in _build_master
   File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 598, in _build_from_requirements
   File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 786, in resolve
 pkg_resources.DistributionNotFound: The 'idna<3,>=2.5' distribution was not found and is required by requests

Fixes:
https://gitlab.com/kubu93/buildroot/-/jobs/1522848327

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>