chore(deps): update dependency swagger-plugin-for-sphinx to v6

Author: renovate[bot]

pyproject.toml

@@ -184,7 +184,7 @@ dev = [
     "sphinx_selective_exclude>=1.0.3,<2",
     "sphinx-toolbox>=3.9.0,<4",
     "sphinxext.opengraph>=0.9.1,<1",
-    "swagger-plugin-for-sphinx>=5.2.0,<6",
+    "swagger-plugin-for-sphinx>=6,<7",
     "tomli>=2.3.0,<3",
     "types-pyyaml>=6.0.12.20250915,<7",
     "types-requests>=2.32.4.20250913,<3",