chore(deps): update dependency narwhals to v2

Author: renovate[bot]

requirements.txt

@@ -191,7 +191,7 @@ mypy-extensions==1.0.0
     # via
     #   black
     #   mypy
-narwhals==1.35.0
+narwhals==2.1.2
     # via plotly
 natsort==8.4.0
     # via py-pilecore (pyproject.toml)