Deprecated commands in actions set-output

[ff6347]

The GitHub actions commands set-output and set-state will be deprecated see this blog post --> https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

This repo is using the set-output

A fix for setting the node version could be the following action step:

jobs:
  build:
    runs-on: ubuntu-latest
    steps: 
      - name: Set nvmrc version as .env variable
        run: echo "NODE_VERSION=$(cat .nvmrc)" >> $GITHUB_ENV
            - name: Use Node.js (.nvmrc)
              uses: actions/setup-node@v3
              with:
                node-version: "${{ env.NODE_VERSION }}"

[ff6347]

The code using this feature is located here --> https://github.com/search?q=repo%3Atechnologiestiftung%2Fgiessdenkiez-de-osm-pumpen-harvester%20set-output&type=code

@JensWinter If you want to fix this one we would be eternally grateful

[JensWinter]

Closed by #42