Bump sphinx from 7.2.6 to 7.3.7 in /requirements

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] <support@github.com>

requirements/dev.txt

@@ -130,7 +130,7 @@ six==1.16.0
     # via python-dateutil
 snowballstemmer==2.2.0
     # via sphinx
-sphinx==7.2.6
+sphinx==7.3.7
     # via
     #   -r docs.in
     #   pallets-sphinx-themes

requirements/docs.txt

@@ -4,7 +4,7 @@
 #
 #    pip-compile requirements/docs.in
 #
-alabaster==0.7.12
+alabaster==0.7.16
     # via sphinx
 babel==2.9.1
     # via sphinx
@@ -42,7 +42,7 @@ requests==2.31.0
     # via sphinx
 snowballstemmer==2.1.0
     # via sphinx
-sphinx==7.2.6
+sphinx==7.3.7
     # via
     #   -r docs.in
     #   pallets-sphinx-themes