[nrf fromtree] doc: allow up to breathe 4.28.x

It looks like latest release (4.29.0) breaks docs build.

Signed-off-by: Gerard Marull-Paretas <[email protected]>

Author: gmarull

scripts/requirements-doc.txt

@@ -1,6 +1,6 @@
 # DOC: used to generate docs
 
-breathe>=4.23.0
+breathe>=4.23.0,<4.29.0
 sphinx>=3.3.0,<3.4.0
 sphinx_rtd_theme>=0.5.2,<1.0
 sphinx-tabs