Update dependencies

Author: philwareham

package.json

@@ -2,7 +2,7 @@
   "name": "textpattern-default-theme",
   "title": "Default theme",
   "txp-type": "textpattern-theme",
-  "version": "4.8.5",
+  "version": "4.8.6",
   "description": "The default theme that ships as standard with Textpattern CMS.",
   "author": "Team Textpattern",
   "homepage": "https://github.com/textpattern/textpattern-default-theme",
@@ -25,21 +25,22 @@
     "url": "https://github.com/textpattern/textpattern-default-theme/issues"
   },
   "devDependencies": {
-    "autoprefixer": "9.8.6",
+    "autoprefixer": "10.2.6",
     "clean-webpack-plugin": "3.0.0",
-    "copy-webpack-plugin": "7.0.0",
+    "copy-webpack-plugin": "9.0.0",
     "cross-env": "7.0.3",
-    "css-loader": "5.0.1",
-    "mini-css-extract-plugin": "1.3.3",
-    "postcss-loader": "3.0.0",
-    "sass": "1.30.0",
-    "sass-loader": "10.1.0",
-    "stylelint": "13.8.0",
+    "css-loader": "5.2.6",
+    "mini-css-extract-plugin": "1.6.0",
+    "postcss": "8.3.0",
+    "postcss-loader": "5.3.0",
+    "sass": "1.34.0",
+    "sass-loader": "11.1.1",
+    "stylelint": "13.13.1",
     "stylelint-order": "4.1.0",
-    "stylelint-scss": "3.18.0",
+    "stylelint-scss": "3.19.0",
     "stylelint-webpack-plugin": "2.1.1",
-    "webpack": "5.11.0",
-    "webpack-cli": "4.2.0",
+    "webpack": "5.38.1",
+    "webpack-cli": "4.7.0",
     "webpack-manifest-version-sync-plugin": "0.0.4"
   },
   "browserslist": [

webpack.config.js

@@ -8,6 +8,7 @@ const MiniCssExtractPlugin = require('mini-css-extract-plugin');
 const StyleLintPlugin = require('stylelint-webpack-plugin');
 
 module.exports = {
+    mode: 'production',
     entry: {
         'styles/default.css': './src/scss/default.scss'
     },
@@ -30,7 +31,11 @@ module.exports = {
                     {
                         loader: 'postcss-loader',
                         options: {
-                            plugins: [require('autoprefixer')],
+                            postcssOptions: {
+                                plugins: [
+                                    'autoprefixer',
+                                ],
+                            },
                         },
                     },
                     {