Theme: upgrade dependencies & minor update of the grunt scripts

Remove webfont grunt script
Update clean grunt script

searx/static/themes/simple/package.json

@@ -1,7 +1,7 @@
 {
   "devDependencies": {
-    "eslint": "^8.11.0",
-    "grunt": "~1.5.2",
+    "eslint": "^8.18.0",
+    "grunt": "~1.5.3",
     "grunt-contrib-copy": "^1.0.0",
     "grunt-contrib-cssmin": "^4.0.0",
     "grunt-contrib-less": "~3.0.0",
@@ -11,18 +11,18 @@
     "grunt-eslint": "^24.0.0",
     "grunt-stylelint": "^0.16.0",
     "grunt-image": "^6.4.0",
-    "ionicons": "^6.0.1",
-    "less": "^4.1.2",
+    "ionicons": "^6.0.2",
+    "less": "^4.1.3",
     "less-plugin-clean-css": "^1.5.1",
-    "sharp": "^0.30.3",
+    "sharp": "^0.30.6",
     "stylelint": "^13.13.1",
     "stylelint-config-standard": "^22.0.0",
-    "ejs": "^3.1.6",
+    "ejs": "^3.1.8",
     "svgo": "^2.8.0"
   },
   "dependencies": {
     "autocomplete-js": "2.7.1",
-    "leaflet": "^1.7.1",
+    "leaflet": "^1.8.0",
     "normalize.css": "^8.0.1"
   },
   "scripts": {
@@ -32,8 +32,7 @@
     "eslint": "grunt eslint",
     "eslint-fix": "grunt eslint --fix",
     "watch": "grunt watch",
-    "webfont": "grunt webfont",
-    "clean": "rm -Rf node_modules package-lock.json ion.less",
+    "clean": "rm -Rf node_modules package-lock.json",
     "stylelint": "grunt stylelint",
     "stylelint-fix": "grunt stylelint --fix"
   }