doc: Relax Sphinx pip dependency
As Zephyr now supports Python 3.10 and onwards, we can use
more recent versions of Sphinx, i.e 7.3.x at the time of this commit.
Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>
diff --git a/doc/requirements.txt b/doc/requirements.txt
index 983a29d..bb12e24 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,7 +1,7 @@
# DOC: used to generate docs
breathe>=4.34
-sphinx~=7.1.0
+sphinx
sphinx_rtd_theme~=2.0
sphinx-tabs
sphinxcontrib-svg2pdfconverter
