Bump the dependencies group with 2 updates

Bumps the dependencies group with 2 updates: [furo](https://github.com/pradyunsg/furo) and [mypy](https://github.com/python/mypy).


Updates `furo` from 2024.8.6 to 2025.12.19
- [Release notes](https://github.com/pradyunsg/furo/releases)
- [Changelog](https://github.com/pradyunsg/furo/blob/main/docs/changelog.md)
- [Commits](pradyunsg/furo@2024.08.06...2025.12.19)

Updates `mypy` from 1.14 to 1.19.1
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.14.0...v1.19.1)

---
updated-dependencies:
- dependency-name: furo
  dependency-version: 2025.12.19
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: dependencies
- dependency-name: mypy
  dependency-version: 1.19.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: dependencies
...

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

Author: dependabot[bot]

pyproject.toml

@@ -27,7 +27,7 @@ dependencies = [ "httpx<1,>=0.21.3", "python-dateutil>=2.8.1" ]
 optional-dependencies.all = [ "webdav4[fsspec,http2]" ]
 optional-dependencies.dev = [ "webdav4[docs,fsspec,http2,qa,tests]" ]
 optional-dependencies.docs = [
-  "furo==2024.8.6; python_version=='3.8'",
+  "furo==2025.12.19; python_version=='3.8'",
   "furo==2025.12.19; python_version>='3.9'",
   "myst-parser>=3,<6",
   "sphinx>=7,<10",
@@ -36,7 +36,7 @@ optional-dependencies.docs = [
 optional-dependencies.fsspec = [ "fsspec>=2021.7" ]
 optional-dependencies.http2 = [ "httpx[http2]<1,>=0.20" ]
 optional-dependencies.qa = [
-  "mypy==1.14; python_version=='3.8'",
+  "mypy==1.19.1; python_version=='3.8'",
   "mypy==1.19.1; python_version>='3.9'",
   "pre-commit",
   "types-colorama",