simple theme: upgrade some of dependencies

* less-plugin-clean-css: no updated version.
  @wikipedia/less-plugin-clean-css might be an alternative.

* stylelint & stylelint-config-standard
  the new versions require configuration and source code changes

package.json

@@ -1,6 +1,6 @@
 {
   "dependencies": {
-    "eslint": "^8.7.0",
+    "eslint": "^8.11.0",
     "pyright": "^1.1.215"
   }
 }

searx/static/themes/simple/package.json

@@ -1,6 +1,6 @@
 {
   "devDependencies": {
-    "eslint": "^8.0.1",
+    "eslint": "^8.11.0",
     "grunt": "~1.4.1",
     "grunt-contrib-copy": "^1.0.0",
     "grunt-contrib-cssmin": "^4.0.0",
@@ -11,10 +11,10 @@
     "grunt-eslint": "^24.0.0",
     "grunt-stylelint": "^0.16.0",
     "grunt-image": "^6.4.0",
-    "ionicons": "^6.0.0",
-    "less": "^4.1.1",
+    "ionicons": "^6.0.1",
+    "less": "^4.1.2",
     "less-plugin-clean-css": "^1.5.1",
-    "sharp": "^0.30.0",
+    "sharp": "^0.30.3",
     "stylelint": "^13.13.1",
     "stylelint-config-standard": "^22.0.0",
     "ejs": "^3.1.6",