Bump sphinx from 7.2.6 to 7.3.7 in /docs

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 7.2.6 to 7.3.7.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v7.2.6...v7.3.7)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

docs/requirements.txt

@@ -4,7 +4,7 @@
 #
 #    pip-compile --output-file=requirements.txt requirements.in
 #
-alabaster==0.7.13
+alabaster==0.7.16
     # via sphinx
 babel==2.12.1
     # via sphinx
@@ -55,7 +55,7 @@ requests==2.31.0
     # via sphinx
 snowballstemmer==2.2.0
     # via sphinx
-sphinx==7.2.6
+sphinx==7.3.7
     # via
     #   -r requirements.in
     #   myst-parser
@@ -88,5 +88,7 @@ sphinxcontrib-runcmd==0.2.0
     # via sphinxcontrib-datatemplates
 sphinxcontrib-serializinghtml==1.1.9
     # via sphinx
+tomli==2.0.1
+    # via sphinx
 urllib3==2.0.4
     # via requests