v2.1.1
DOC: migrate from sphinx-panels to sphinx-design (#46227)
TST: Use pytest or assert_produces_warnings instead of catch_warnings (#54390)
Backport PR #54633 on branch 2.1.x (DEP: remove python-snappy and brotli as optional dependencies (no longer used)) (#54637)
Backport PR #54838 on branch 2.1.x (Don't expose EA.pad_or_backfill to users + switch to DeprecationWarning) (#54851)
Backport PR #55189 on branch 2.1.x (Revert "DEPR: Deprecate returning a DataFrame in SeriesApply.apply_standard) (#55205)
Backport PR #55207 on branch 2.1.x (DOC: Add whatsnew for 2.1.2) (#55221)
STY: Enable ruff perflint (#54236)