Dockerfile: Update python version and deprecated maintainer

jwasham / computer-science-flash-cards

Mini website for testing both general CS knowledge and enforce coding practice and common algorithm/data structure memorization.

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Closed hofbi closed 3 years ago

hofbi commented 3 years ago

Update python version of docker from 3.5 to 3.9 as 3.5 is EOL
Replace deprecated MAINTAINER with LABEL (see https://docs.docker.com/engine/reference/builder/#maintainer-deprecated)