toml: move from toml to tomllib + tomli_w

* toml is getting removed from distributions due to being generally
  unmaintained and not support the lastest TOML standard.
* For parsing use tomllib which is included in python3.11 and tomli for
  earlier interpeter versions.
* For writing use tomli-w. tomli-w.dump() expects bytes-like objects so
  work around it to keep compatability and minimize changes elsewhere.

Signed-off-by: Alfred Wingate <parona@protonmail.com>

setup.py

@@ -50,7 +50,8 @@ setup(
     install_requires=[
         'docopt', 'Jinja2', 'ruamel.yaml',
         'python-magic', 'packaging', 'requests',
-        'toml', 'distro'],
+        'tomli; python_version < "3.11"',
+        'tomli_w', 'distro'],
 
     extras_require={
         'dev': ['check-manifest'],