lower PyYAML and psutil version requirements

RHEL8 and derivatives carry PyYAML 3.12 and psutil 5.4.3 built for the
default python 3.6 in the base OS repository. Consequently, solaar is
not installable without installing python38 or python39 stack (called
module in RHEL/Fedora) that carry newer versions of these two.

solaar seems to work fine with these older versions as
[confirmed](https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2022-f65a1a9d86)
by @mefuller .

Fixes #1418 .

setup.py

@@ -62,9 +62,9 @@ For instructions on installing Solaar see https://pwr-solaar.github.io/Solaar/in
     python_requires='>=3.6',
     install_requires=[
         'pyudev (>= 0.13)',
-        'PyYAML (>= 5.1)',
+        'PyYAML (>= 3.12)',
         'python-xlib (>= 0.27)',
-        'psutil (>= 5.6.0)',
+        'psutil (>= 5.4.3)',
     ],
     package_dir={'': 'lib'},
     packages=['hidapi', 'logitech_receiver', 'solaar', 'solaar.ui', 'solaar.cli'],