[ci] Do not use the set-output command
[ci] Do not use the set-output command

The `set-output` command is deprecated. Use the `GITHUB_OUTPUT`
environment file.

Refs: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

websockets/bufferutil,websockets/bufferutil,websockets/bufferutil