chore: bump pytest from 9.0.1 to 9.1.0 (#659)

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Author: dependabot[bot]

poetry.lock

@@ -43,7 +43,7 @@ myst-parser = "^4.0.1"
 nox = "^2025.11.12"
 polars = ">=1.41.2"
 pre-commit = "^4.6.0"
-pytest = ">8"
+pytest = ">=9.1.0"
 # pytest-regtest compat https://gitlab.com/uweschmitt/pytest-regtest/-/merge_requests/9
 py = "1.11"
 pytest-clarity = "^1.0.1"