[Snyk] Security upgrade pillow from 6.2.2 to 6.2.3#4

snyk-bot wants to merge 1 commit intomasterMartinThoma/algorithms:masterfrom

snyk-fix-9148ba362be5109f9a3d49f7a881d8ebMartinThoma/algorithms:snyk-fix-9148ba362be5109f9a3d49f7a881d8ebCopy head branch name to clipboard