Revert "CI: fix conda version (#19025)" (#19062)
Revert "CI: fix conda version (#19025)" (#19062)

This reverts commit c19bdc98fa3f856e2e6b3495bbab88b587801987.
gfyoung/pandas,harisbal/pandas,amolkahat/pandas,cbertinato/pandas,GuessWhoSamFoo/pandas,dsm054/pandas,harisbal/pandas,rs2/pandas,rs2/pandas,toobaz/pandas,kdebrab/pandas,cython-testbed/pandas,jreback/pandas,TomAugspurger/pandas,datapythonista/pandas,cython-testbed/pandas,GuessWhoSamFoo/pandas,datapythonista/pandas,jreback/pandas,TomAugspurger/pandas,GuessWhoSamFoo/pandas,pandas-dev/pandas,gfyoung/pandas,gfyoung/pandas,GuessWhoSamFoo/pandas,cbertinato/pandas,toobaz/pandas,pratapvardhan/pandas,pratapvardhan/pandas,datapythonista/pandas,pratapvardhan/pandas,dsm054/pandas,dsm054/pandas,louispotok/pandas,kdebrab/pandas,pandas-dev/pandas,jorisvandenbossche/pandas,louispotok/pandas,cython-testbed/pandas,toobaz/pandas,pratapvardhan/pandas,rs2/pandas,rs2/pandas,pandas-dev/pandas,pratapvardhan/pandas,TomAugspurger/pandas,MJuddBooth/pandas,toobaz/pandas,cbertinato/pandas,jreback/pandas,dsm054/pandas,amolkahat/pandas,harisbal/pandas,amolkahat/pandas,dsm054/pandas,pandas-dev/pandas,jreback/pandas,TomAugspurger/pandas,toobaz/pandas,jorisvandenbossche/pandas,amolkahat/pandas,MJuddBooth/pandas,datapythonista/pandas,gfyoung/pandas,cython-testbed/pandas,MJuddBooth/pandas,harisbal/pandas,louispotok/pandas,kdebrab/pandas,gfyoung/pandas,jorisvandenbossche/pandas,kdebrab/pandas,cbertinato/pandas,harisbal/pandas,jreback/pandas,kdebrab/pandas,louispotok/pandas,jorisvandenbossche/pandas,MJuddBooth/pandas,amolkahat/pandas,cbertinato/pandas,MJuddBooth/pandas,louispotok/pandas,GuessWhoSamFoo/pandas,cython-testbed/pandas