Bump sphinx from 8.2.3 to 9.1.0 (#1032)

* Bump sphinx from 8.2.3 to 9.1.0

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 8.2.3 to 9.1.0.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v8.2.3...v9.1.0)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-version: 9.1.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update tox.ini to be in line with marshmallow

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Steven Loria <git@stevenloria.com>

Author: dependabot[bot]

CONTRIBUTING.rst

@@ -121,7 +121,7 @@ Contributions to the documentation are welcome. Documentation is written in `reS
 
 To build the docs in "watch" mode: ::
 
-   $ tox -e watch-docs
+   $ tox -e docs-serve
 
 Changes in the `docs/` directory will automatically trigger a rebuild.
 

pyproject.toml

@@ -76,7 +76,7 @@ tests = [
 ]
 docs = [
   "webargs[frameworks]",
-  "Sphinx==8.2.3",
+  "Sphinx==9.1.0",
   "sphinx-issues==5.0.1",
   "furo==2025.12.19",
 ]

tox.ini

@@ -40,13 +40,13 @@ commands = sphinx-build docs/ docs/_build {posargs}
 
 ; Below tasks are for development only (not run in CI)
 
-[testenv:watch-docs]
-deps =
-  sphinx-autobuild
+[testenv:docs-serve]
+deps = sphinx-autobuild
 extras = docs
-commands = sphinx-autobuild --open-browser docs/ docs/_build {posargs} --watch src/webargs --delay 2
+commands = sphinx-autobuild --port=0 --open-browser --delay=2 docs/ docs/_build {posargs} --watch src --watch CONTRIBUTING.rst --watch README.rst
 
-[testenv:watch-readme]
+[testenv:readme-serve]
 deps = restview
 skip_install = true
 commands = restview README.rst
+