Sphinx 5 Compatibility: `nodes.Node.traverse() is obsoleted by Node.findall()`

[lukasjuhrich]

Similarly to numpy/numpydoc#399, I get a PendingDeprecationWarning when building my docs using sphinx-paramlinks:

[…snip…]
/opt/pycroft/venv/lib/python3.11/site-packages/sphinx_paramlinks/sphinx_paramlinks.py:195: PendingDeprecationWarning: nodes.Node.traverse() is obsoleted by Node.findall().
  for ref in self.document.traverse(nodes.strong):                                                                               
/opt/pycroft/venv/lib/python3.11/site-packages/sphinx_paramlinks/sphinx_paramlinks.py:146: PendingDeprecationWarning: nodes.Node.traverse() is obsoleted by Node.findall().
  for ref in self.document.traverse(addnodes.pending_xref):                                                                      
reading sources... [100%] search                                                                                                 
/opt/pycroft/venv/lib/python3.11/site-packages/sphinx_paramlinks/sphinx_paramlinks.py:195: PendingDeprecationWarning: nodes.Node.traverse() is obsoleted by Node.findall().
  for ref in self.document.traverse(nodes.strong):          
/opt/pycroft/venv/lib/python3.11/site-packages/sphinx_paramlinks/sphinx_paramlinks.py:146: PendingDeprecationWarning: nodes.Node.traverse() is obsoleted by Node.findall().
  for ref in self.document.traverse(addnodes.pending_xref):

I don't know much about the internals here, but here are the reference docs for findall.