py-breathe: updated to 4.34.0

Breathe v4.34.0
Treat .unparsed as plain text.
Remove unneeded type: ignore annotations.
Fix internal NodeFinder visitor for when non-Docutils nodes are present in the content of a directive.
Rename lint workflow.
Type check pygments and limit docutils stub version.
Convert dot files' relative path to absolute.
CI, update Sphinx versions to test.
CI, update for Sphinx 5.0.1.
Fix inconsistency in example.
Fix C# enum rendering crash.
Drop Sphinx 3 support, add Sphinx 5 support.
CICD: Disable python 3.6 for Sphinx master tests.
Populate default include text-node's data field instead of raw-source.

(adam)