updated gulpfiles to gulp4

web/themes/custom/edlptheme/package.json

@@ -7,7 +7,7 @@
   "license": "GPLv3",
   "homepage": "https://encyclopediedelaparole.org",
   "devDependencies": {
-    "gulp": "latest",
+    "gulp": "^4.0.2",
     "gulp-autoprefixer": "^5.0.0",
     "gulp-concat": "latest",
     "gulp-cssmin": "latest",
@@ -16,13 +16,14 @@
     "gulp-json-to-sass": "latest",
     "gulp-json2js": "latest",
     "gulp-rename": "latest",
-    "gulp-sass": "^4.0.1",
+    "gulp-sass": "^4.0.2",
     "gulp-strip-debug": "^3.0.0",
     "gulp-svgmin": "^1.2.4",
     "gulp-util": "latest",
     "gulp-watch": "latest",
-    "main-bower-files": "latest",
-    "minimist": "^1.2.0"
+    "main-bower-files": "^2.13.3",
+    "minimist": "^1.2.0",
+    "node-sass": "^4.12.0"
   },
   "dependencies": {}
 }