DOC: Add whatsnew

[vangorade]

• closes BUG: Unexpected typecast on datetime.date in groupby.key() #38878
• tests added / passed
• Ensure all linting tests pass, see here for how to run them
• whatsnew entry

[MarcoGorelli]

Thanks @vangorade - can you rebase so as to drop the unrelated commits please?

[vangorade]

did i just messed up something @MarcoGorelli?

[MarcoGorelli]

possibly :) no worries though - at this point I think the easiest thing might be to just do

git fetch upstream --prune
git reset --hard upstream/master
<make the same changes you'd made previously>
git add -u
git commit -m <commit message>
git push origin HEAD -f

[vangorade]

possibly :) no worries though - at this point I think the easiest thing might be to just do

git fetch upstream --prune
git reset --hard upstream/master
<make the same changes you'd made previously>
git add -u
git commit -m <commit message>
git push origin HEAD -f

Thanks :). I thought i broke something, after some google search i learned about this issue and how to time travel in git and thanks to your reply i finally resolve this issue 👍 !

[jreback]

thanks @vangorade