[conf] Bump Sphinx to 9

Author: SilverRainZ

.github/workflows/gh-pages.yml

@@ -48,6 +48,6 @@ jobs:
         sphinx_build_options: --conf-dir .
         cache: true
         python_version: 3.12
-        sphinx_version: 8.2.3
+        sphinx_version: 9.1.0
         checkout: false
         publish: ${{ github.ref_name == 'master' }}

requirements.txt

@@ -29,10 +29,10 @@ sphinx-notfound-page
 sphinxcontrib-youtube
 sphinx-last-updated-by-git
 sphinxnotes-comboroles
-sphinxcontrib-globalsubs==0.1.2
+sphinxcontrib-globalsubs>=1.0.0
 sphinx_simplepdf
 sphinxnotes-fasthtml
 pyyaml
 sphinxnotes-poc@git+https://github.com/sphinx-notes/poc.git@master
-shibuya==2025.9.25
+shibuya==2026.1.9
 sphinxnotes-data@git+https://github.com/sphinx-notes/data.git@master