officially support sphinx=7 and sphinx=8 (#140)

* test the two latest minor versions for `sphinx=7` and `sphinx=8`

* whats-new

Author: keewis

.github/workflows/ci.yaml

@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ["3.9", "3.12", "3.13"]
-        sphinx-version: ["5.3", "6.0", "6.1"]
+        sphinx-version: ["5.3", "6.2", "7.3", "7.4", "8.0", "8.1"]
 
     steps:
       - name: checkout the repository

docs/whats-new.rst

@@ -4,6 +4,8 @@ What's new
 2025.02.0 (*unreleased*)
 ------------------------
 - drop support for python 3.8 (:pull:`135`)
+- drop support for ``sphinx<5.3`` (:pull:`138`)
+- officially support python 3.12 and 3.13 (:pull:`136`)
 
 2023.04.0 (2022-04-12)
 ----------------------