deps: bump sphinx from 5.3.0 to 7.1.2 (#861)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 5.3.0 to 7.1.2.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v5.3.0...v7.1.2)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

poetry.lock

@@ -44,7 +44,7 @@ coverage = {extras = ["toml"], version = ">=6.5,<8.0"}
 safety = ">=2.3.1,<4.0.0"
 mypy = ">=0.991,<1.5"
 xdoctest = {extras = ["colors"], version = "^1.1.0"}
-sphinx = ">=4.3.2,<6.0.0"
+sphinx = ">=4.3.2,<8.0.0"
 sphinx-autobuild = ">=2021.3.14"
 pre-commit = ">=2.12.1"
 pep8-naming = "^0.13.2"