chore: bump sphinx-rtd-theme from 3.0.0 to 3.1.0 (#614)

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Author: dependabot[bot]

poetry.lock

@@ -55,7 +55,7 @@ pytest-xdist = "^3.8.0"
 python-semantic-release = "^10.5.2"
 ruff = "^0.14.0"
 safety = "^3"
-sphinx-rtd-theme = "^3.0.0"
+sphinx-rtd-theme = "^3.1.0"
 twine = "^6.2.0"
 xdoctest = "^1.3.0"