We can agree that, from node-sass you can get the versions using :

var sass = require('node-sass');

console.log(sass.info);

From gulp-sass, you can send data which will be executed by node-sass. So something like this should do the trick :

var gulp = require('gulp');
var sass = require('gulp-sass'); 
console.log(sass.info);

It's going to be the .info() from node-sass who get's called in the end, giving you both it's version and libsass's version.

From sass github repository

import dartSass from 'sass';
import gulpSass from 'gulp-sass';
const sass = gulpSass( dartSass );

If you, like me, use a modular system. Then this solution should help you!
You need to install SASS
It is also necessary that the gulp-sass be installed

import pkg from 'gulp';
const { src, dest, series, watch } = pkg;
import concat from 'gulp-concat'

import dartSass from 'sass'
import gulpSass from 'gulp-sass'
const sass = gulpSass(dartSass)

function scss() {
    return src('app/scss/**/*.scss', { sourcemaps: true })
        .pipe(sass.sync().on('error', sass.logError)) // scss to css
        .pipe(concat('style.min.css'))
        .pipe(dest(config.build.style, { sourcemaps: '../sourcemaps/' }))
}

async function builds() { scss() }
export { builds }