Bump prismjs from 1.15.0 to 1.21.0 in /website#28

dependabot[bot] wants to merge 1 commit intosourcegraphql-compose/graphql-compose.github.io:sourcefrom

dependabot/npm_and_yarn/website/prismjs-1.21.0graphql-compose/graphql-compose.github.io:dependabot/npm_and_yarn/website/prismjs-1.21.0Copy head branch name to clipboard