Upgrade pillow to latest that supports python 2.7 (6.2.2) #3134
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We can't fix all of the vulnerabilities of pillow (#2820) because we can't upgrade to the latest version, since it only supports python 3. For the meantime, we might as well fix some vulnerabilities by upgrading a few versions. I tested the teacher biography module (the only place we use pillow) and it still works fine.