Deps: Update furo requirement from >=2022.6.21 to >=2025.12.19

Updates the requirements on [furo](https://github.com/pradyunsg/furo) to permit the latest version.
- [Release notes](https://github.com/pradyunsg/furo/releases)
- [Changelog](https://github.com/pradyunsg/furo/blob/main/docs/changelog.md)
- [Commits](pradyunsg/furo@2022.06.21...2025.12.19)

---
updated-dependencies:
- dependency-name: furo
  dependency-version: 2025.12.19
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pyproject.toml

@@ -37,7 +37,7 @@ dev = [
     "autohooks-plugin-ruff>=25.2.0",
     "autohooks-plugin-mypy>=22.7.0",
     "pontos>=26.4.0",
-    "furo>=2022.6.21",
+    "furo>=2025.12.19",
     "lxml-stubs>=0.5.1,<0.6",
     "types-paramiko>=3.4.0.20240205,<5.0.0.0",
     "git-cliff>=2.8.0,<3",