Update kroese/set-variable action to v4

        echo "NEW_MINOR=$((${{ vars.MINOR }}+1))" >> $GITHUB_ENV

    -

      name: Update minor version variable

      uses: kroese/set-variable@v3

      uses: kroese/set-variable@v4

      with:

        name: 'MINOR'

        value: ${{ env.NEW_MINOR }}