Bump furo from 2025.7.19 to 2025.12.19 (#42)

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

Author: dependabot[bot]

docs/requirements.txt

@@ -1,4 +1,4 @@
-furo==2025.7.19
+furo==2025.12.19
 Sphinx==9.1.0
 myst-parser==4.0.1
 sphinx-autodoc-typehints==3.6.3