[LTP] [PATCH 1/1] sphinx: Update to 7.2.6, python 3.12, ubuntu-24.04

[Petr Vorel]

Update sphinx to 7.2.6, python 3.12. This requires to update
.readthedocs.yml to use ubuntu-24.04 [1], because keep in sync sphinx in
readthedocs with with the one for local development and github CI.
Raising python makes sense, as development is usually done on newer
distros, we were still using old python 3.6.

This fixes the problem on local development trying to run older sphinx
5.3 on python 3.13 requires to use imghdr, which was removed from
standard library (alternatively we'd need to install it from pip via
adding standard-imghdr into requirements.txt).

[1] https://about.readthedocs.com/blog/2024/06/ubuntu-24-04/

Fixes: b900b790e9 ("doc: Add sphinx to requirements.txt")
Signed-off-by: Petr Vorel <pvorel@suse.cz>
---
Hi,

first, I'm sorry for a regression. I tested all the previous versions
carefully even locally, but in the end the final variant I obviously
omit to test.

Tested:
https://app.readthedocs.org/projects/linux-test-project/builds/27784588/

Alternatively, we could keep old distros and just add standard-imghdr
(without version) to doc/requirements.txt. But sooner or later we will
need to upgrade thus I'm sending this version.

Kind regards,
Petr

 .readthedocs.yml     | 4 ++--
 doc/requirements.txt | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/.readthedocs.yml b/.readthedocs.yml
index 5434ef49d6..51825da77f 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -1,9 +1,9 @@
 version: 2
 
 build:
-  os: "ubuntu-22.04"
+  os: "ubuntu-24.04"
   tools:
-    python: "3.6"
+    python: "3.12"
   apt_packages:
     - autoconf
     - enchant-2
diff --git a/doc/requirements.txt b/doc/requirements.txt
index 6302ecd9f2..1b9a984547 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,6 +1,6 @@
 # Use the same sphinx as on readthedocs.org. When updated, make sure
 # sphinx-rtd-theme is compatible with sphinx.
-sphinx==5.3.0
+sphinx==7.2.6
 sphinx-rtd-theme==2.0.0
 
 linuxdoc==20231020
-- 
2.49.0