Release action using deprecated set-output GH command

[Create draft release](https://github.com/elixir-lsp/elixir-ls/actions/runs/5319189267/jobs/9631408280#step:2:10)
The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/