Bump nbconvert from 5.6.1 to 6.3.0#50

dependabot[bot] wants to merge 1 commit intomainJackMcKew/pandas_alive:mainfrom

dependabot/pip/nbconvert-6.3.0JackMcKew/pandas_alive:dependabot/pip/nbconvert-6.3.0Copy head branch name to clipboard