PyYAML dependency should have a minimum version

[rpignolet]

Currently the PyYAML dependency is

tdp-lib/pyproject.toml

Line 17 in c056d44

PyYAML = "<6.0.0"

When using PyYAML 3.12 (default version for Rocky 8) I have this error when running tdp init:

2023-03-07 11:41:56,579 - DEBUG - tdp.<module> - Logger initialized
2023-03-07 11:41:57,958 - INFO - tdp.cluster_variables.initialize_cluster_variables - /opt/tdp-manager/tdp_vars/all does not exist, created
2023-03-07 11:41:57,973 - INFO - tdp.service_variables.update_from_variables_folder - Updating all with variables from /opt/tdp-manager/ansible_collections/tosit/tdp/tdp_vars_defaults/all/all.yml
Traceback (most recent call last):
  File "/opt/tdp-manager/venv/bin/tdp", line 8, in <module>
    sys.exit(tdp())
  File "/opt/tdp-manager/venv/lib64/python3.6/site-packages/click/core.py", line 1128, in __call__
    return self.main(*args, **kwargs)
  File "/opt/tdp-manager/venv/lib64/python3.6/site-packages/click/core.py", line 1053, in main
    rv = self.invoke(ctx)
  File "/opt/tdp-manager/venv/lib64/python3.6/site-packages/click/core.py", line 1659, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/opt/tdp-manager/venv/lib64/python3.6/site-packages/click/core.py", line 1395, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/opt/tdp-manager/venv/lib64/python3.6/site-packages/click/core.py", line 754, in invoke
    return __callback(*args, **kwargs)
  File "/opt/tdp-manager/tdp-lib/tdp/cli/commands/init.py", line 28, in init
    collections, vars, overrides, validate=validate
  File "/opt/tdp-manager/tdp-lib/tdp/core/variables/cluster_variables.py", line 95, in initialize_cluster_variables
    "add variables from " + collection_name, path
  File "/opt/tdp-manager/tdp-lib/tdp/core/variables/service_variables.py", line 100, in update_from_variables_folder
    configurations[file.name].merge(variables)
  File "/usr/lib64/python3.6/contextlib.py", line 88, in __exit__
    next(self.gen)
  File "/opt/tdp-manager/tdp-lib/tdp/core/variables/service_variables.py", line 145, in open_var_files
    stack.close()
  File "/usr/lib64/python3.6/contextlib.py", line 336, in close
    self.__exit__(None, None, None)
  File "/usr/lib64/python3.6/contextlib.py", line 380, in __exit__
    raise exc_details[1]
  File "/usr/lib64/python3.6/contextlib.py", line 365, in __exit__
    if cb(*exc_details):
  File "/usr/lib64/python3.6/contextlib.py", line 284, in _exit_wrapper
    return cm_exit(cm, *exc_details)
  File "/usr/lib64/python3.6/contextlib.py", line 88, in __exit__
    next(self.gen)
  File "/opt/tdp-manager/tdp-lib/tdp/core/variables/service_variables.py", line 121, in _open_var_file
    yield variables
  File "/opt/tdp-manager/tdp-lib/tdp/core/variables/variables.py", line 112, in __exit__
    self.close()
  File "/opt/tdp-manager/tdp-lib/tdp/core/variables/variables.py", line 134, in close
    self._flush_on_disk()
  File "/opt/tdp-manager/tdp-lib/tdp/core/variables/variables.py", line 125, in _flush_on_disk
    yaml.dump(self._content, Dumper=Dumper, sort_keys=False, width=1000)
  File "/usr/lib64/python3.6/site-packages/yaml/__init__.py", line 200, in dump
    return dump_all([data], stream, Dumper=Dumper, **kwds)
TypeError: dump_all() got an unexpected keyword argument 'sort_keys'

We need a minimum version for PyYAML.