Backport PR #55211 on branch 2.1.x (DOC: Add release date for 2.1.1)#55218

phofl merged 1 commit intopandas-dev:2.1.xpandas-dev/pandas:2.1.xfrom

meeseeksmachine:auto-backport-of-pr-55211-on-2.1.xmeeseeksmachine/pandas:auto-backport-of-pr-55211-on-2.1.xCopy head branch name to clipboard