v2.1.2
DOC: migrate from sphinx-panels to sphinx-design (#46227)
TST: Use pytest or assert_produces_warnings instead of catch_warnings (#54390)
Backport PR #55275 on branch 2.1.x (Update pyproject.toml - replace `output_formatting` with `output-formatting`) (#55291)
Backport PR #54838 on branch 2.1.x (Don't expose EA.pad_or_backfill to users + switch to DeprecationWarning) (#54851)
Backport PR #55337 on branch 2.1.x (DOC: Adjust user guide for CoW docs) (#55532)
Backport PR #55691 on branch 2.1.x (REGR: fix read_parquet with column of large strings (avoid overflow from concat)) (#55706)
STY: Enable ruff perflint (#54236)