Update Mermaid to 8.5.1
Updates Mermaid library to 8.5.1: https://github.com/mermaid-js/mermaid/releases/tag/8.5.1.
CC @gl-docsteam
CC @stanhu who often keeps GitLab itself up to date.
Updates Mermaid library to 8.5.1: https://github.com/mermaid-js/mermaid/releases/tag/8.5.1.
CC @gl-docsteam
CC @stanhu who often keeps GitLab itself up to date.