chore: migrate pyproject.toml file for docs dependencies

Author: jondricek

pyproject.toml

@@ -57,6 +57,11 @@ classifiers = [
     "Operating System :: OS Independent",
 ]
 
+[project.optional-dependencies]
+docs = [
+    "sphinx>=8.2.3",
+    "sphinx_rtd_theme>=3.0.2"
+]
 
 [tool.poetry.group.dev]
 optional = true
@@ -69,13 +74,6 @@ pytest-dotenv = ">=0.5.2"
 ruff = ">=0.9.9"
 responses = ">=0.25.8"
 
-[tool.poetry.group.docs]
-optional = true
-
-[tool.poetry.group.docs.dependencies]
-sphinx = ">=8.2.3"
-sphinx_rtd_theme = ">=3.0.2"
-
 [build-system]
 requires = ["poetry-core>=2.0.0,<3.0.0"]
 build-backend = "poetry.core.masonry.api"