Merge pull request #2626 from VWS-Python/dependabot/pip/sphinx-substitution-extensions-2025.6.6

Bump sphinx-substitution-extensions from 2025.4.3 to 2025.6.6

Author: github-actions[bot]

pyproject.toml

@@ -91,7 +91,7 @@ optional-dependencies.dev = [
     "sphinx-lint==1.0.0",
     "sphinx-paramlinks==0.6",
     "sphinx-pyproject==0.3.0",
-    "sphinx-substitution-extensions==2025.4.3",
+    "sphinx-substitution-extensions==2025.6.6",
     "sphinx-toolbox==4.0.0",
     "sphinxcontrib-httpdomain==1.8.1",
     "sphinxcontrib-spelling==8.0.1",