[Snyk] Upgrade gatsby-plugin-mdx from 3.18.1 to 5.15.0#2002

FengShangWuQi wants to merge 1 commit intodevFengShangWuQi/fengshangwuqi.github.io:devfrom

snyk-upgrade-6b577086cd8fbd1dacfb5e56ca29b14dFengShangWuQi/fengshangwuqi.github.io:snyk-upgrade-6b577086cd8fbd1dacfb5e56ca29b14dCopy head branch name to clipboard