Set output still showing warning (will break on 31 May 2023)

[alan-cooney]

Output of action here:

Run booxmedialtd/ws-action-parse-semver@v1.4.6
  with:
    input_string: v1.38.0

Warning: 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/[2](https://github.com/alan-cooney/CircuitsVis/actions/runs/3882658630/jobs/6623065874#step:2:2)022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

It looks like this is because the GITHUB_OUTPUT env variable doesn't exist. Relevant part of my workflow:

name: Release

on:
  release:
    types:
      - published

jobs:
  checks:
    name: Run checks workflow
    uses: alan-cooney/CircuitsVis/.github/workflows/checks.yml@main

  semver-parser:
    name: Parse the semantic version from the release
    runs-on: ubuntu-latest
    steps:
     - name: Parse semver string
       id: semver_parser 
       uses: booxmedialtd/ws-action-parse-semver@v1.4.6
       with:
         input_string: ${{ github.event.release.tag_name }}
    outputs:
      major: "${{ steps.semver_parser.outputs.major }}"
      minor: "${{ steps.semver_parser.outputs.minor }}"
      patch: "${{ steps.semver_parser.outputs.patch }}"
      semver: "${{ steps.semver_parser.outputs.fullversion }}"