How did I fix «Err https://deb.nodesource.com/node_0.12 buster Release» / «404 Not Found» in Debian 10 (Buster)?

Node.js
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2023-08-08--06-23-37

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I have fixed it by Node.js upgrade: How did I upgrade Node.js from 9.4 to 20.5 in Debian 10 (Buster)?

It placed the right contents to /etc/apt/sources.list.d/nodesource.list: