update circleCI image to python:3.8.11 (#3215)
update circleCI image to python:3.8.11 (#3215)

* update circleCI image to python:3.8.11

* s/3.7/3.8/
RaRe-Technologies/gensim,RaRe-Technologies/gensim,RaRe-Technologies/gensim,RaRe-Technologies/gensim