Bump furo from 2024.8.6 to 2025.7.19 (#676)

--- updated-dependencies: - dependency-name: furo dependency-version: 2025.7.19 dependency-type: direct:production update-type: version-update:semver-major ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pyproject.toml

@@ -30,7 +30,7 @@ Source = "https://github.com/marshmallow-code/marshmallow-sqlalchemy"
 
 [project.optional-dependencies]
 docs = [
- "furo==2024.8.6",
+ "furo==2025.7.19",
  "sphinx-copybutton==0.5.2",
  "sphinx-design==0.6.1",
  "sphinx-issues==5.0.1",