deps: update dependency sphinx to v7 (#211)

* deps: update dependency sphinx to v7

* deps: update dependency sphinx-rtd-theme to >=1.3,<1.4

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: jo <ljonas@riseup.net>

Author: renovate[bot]

setup.py

@@ -44,8 +44,8 @@
     ],
     extras_require={
         "docs": [
-            "sphinx>=6.2.1,<7.0",
-            "sphinx-rtd-theme>=1.2.2,<1.3",
+            "sphinx>=7.1.2,<7.2",
+            "sphinx-rtd-theme>=1.3.0,<1.4",
             "myst-parser>=2.0.0,<2.1",
             "watchdog>=3.0.0,<3.1",
         ],