It still happens:
! [ -e /content ] && pip install -Uqq fastai # upgrade fastai on colab
|████████████████████████████████| 194kB 6.5MB/s
|████████████████████████████████| 776.8MB 19kB/s
|████████████████████████████████| 12.8MB 31.2MB/s
|████████████████████████████████| 61kB 6.0MB/s
ERROR: torchtext 0.9.1 has requirement torch==1.8.1, but you’ll have torch 1.7.1 which is incompatible.
You will have to do !pip uninstall torchtext