Bump the production-group group with 2 updates

Bumps the production-group group with 2 updates: [sphinx](https://github.com/sphinx-doc/sphinx) and [sphinxcontrib-tikz](https://bitbucket.org/philexander/tikz).


Updates `sphinx` from 7.3.7 to 7.4.0
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v7.3.7...v7.4.0)

Updates `sphinxcontrib-tikz` from 0.4.19 to 0.4.20
- [Commits](https://bitbucket.org/philexander/tikz/commits)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: production-group
- dependency-name: sphinxcontrib-tikz
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: production-group
...

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

requirements-readthedocs.txt

@@ -73,7 +73,7 @@ scipy==1.14.0
     # via -r requirements-3.12.txt
 snowballstemmer==2.2.0
     # via sphinx
-sphinx==7.3.7
+sphinx==7.4.0
     # via
     #   -r requirements-readthedocs.in
     #   breathe
@@ -99,7 +99,7 @@ sphinxcontrib-qthelp==1.0.7
     # via sphinx
 sphinxcontrib-serializinghtml==1.1.10
     # via sphinx
-sphinxcontrib-tikz==0.4.19
+sphinxcontrib-tikz==0.4.20
     # via -r requirements-readthedocs.in
 urllib3==2.2.2
     # via requests