chore(deps): update dependency sphinx-rtd-theme to v2

pyproject.toml

@@ -25,7 +25,7 @@ requests = "^2"
 Sphinx = "^4.5.0"
 coverage = "^6.3.2 || ^7.0.0"
 myst-parser = "^0.17.0 || ^0.19.0 || ^1.0.0"
-sphinx-rtd-theme = "^1.0.0"
+sphinx-rtd-theme = "^1.0.0 || ^2.0.0"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]