docs: fix AdoptOpenJDK deprecation: use temurin (#446)
docs: fix AdoptOpenJDK deprecation: use temurin (#446)

The [`adoptopenjdk` brew cask is deprecated and no-longer updated since 2021-08-01](https://github.com/AdoptOpenJDK/homebrew-openjdk/blob/f6e8c971c98f5ba48aedf2a5d218ebc914ee2304/README.md#L1,L2).

The [`adoptopenjdk` team recommend switching to the, homebrew maintained, temurin cask instead](https://github.com/AdoptOpenJDK/homebrew-openjdk#-deprecation-notice-).

This PR is a small documentation update to reflect the new recommendation
qjebbs/vscode-plantuml,qjebbs/vscode-plantuml,qjebbs/vscode-plantuml