Update 3rd party dependencies

package.json

@@ -59,7 +59,7 @@
     "@babel/cli": "^7.10.3",
     "@babel/core": "^7.10.5",
     "@babel/plugin-proposal-nullish-coalescing-operator": "^7.10.1",
-    "@babel/plugin-proposal-optional-chaining": "^7.10.3",
+    "@babel/plugin-proposal-optional-chaining": "^7.10.4",
     "@babel/plugin-syntax-dynamic-import": "^7.2.0",
     "@babel/preset-env": "^7.10.2",
     "@converse/headless": "file:src/headless",
@@ -74,7 +74,7 @@
     "clean-webpack-plugin": "^3.0.0",
     "copy-webpack-plugin": "^6.0.2",
     "css-loader": "^3.5.3",
-    "dayjs": "1.8.15",
+    "dayjs": "1.8.30",
     "eslint": "^7.3.0",
     "eslint-plugin-lodash": "^7.1.0",
     "exports-loader": "^0.7.0",
@@ -112,9 +112,9 @@
     "style-loader": "^0.23.1",
     "urijs": "^1.19.2",
     "webpack": "^4.43.0",
-    "webpack-cli": "^3.3.11",
+    "webpack-cli": "^3.3.12",
     "webpack-dev-server": "^3.11.0",
-    "webpack-merge": "^4.2.1",
+    "webpack-merge": "^5.0.9",
     "xss": "^1.0.7"
   },
   "dependencies": {}

webpack.dev.js

 /* global module */
-const merge = require("webpack-merge");
-const prod = require("./webpack.prod.js");
 const MiniCssExtractPlugin = require('mini-css-extract-plugin');
+const prod = require("./webpack.prod.js");
+const { merge } = require("webpack-merge");
 
 module.exports = merge(prod, {
     output: {

webpack.headless.js

 /* global __dirname, module */
 const common = require("./webpack.common.js");
-const merge = require("webpack-merge");
 const path = require('path');
+const { merge } = require("webpack-merge");
 
 module.exports = merge(common, {
     entry: "@converse/headless/headless.js",

webpack.prod.js

 /* global __dirname, module, process */
+const ASSET_PATH = process.env.ASSET_PATH || '/dist/'; // eslint-disable-line no-process-env
+const CopyWebpackPlugin = require('copy-webpack-plugin');
+const MiniCssExtractPlugin = require('mini-css-extract-plugin');
 const common = require("./webpack.common.js");
-const merge = require("webpack-merge");
 const path = require('path');
 const webpack = require('webpack');
 const { CleanWebpackPlugin } = require('clean-webpack-plugin');
-const MiniCssExtractPlugin = require('mini-css-extract-plugin');
-const CopyWebpackPlugin = require('copy-webpack-plugin');
-const ASSET_PATH = process.env.ASSET_PATH || '/dist/'; // eslint-disable-line no-process-env
+const { merge}  = require("webpack-merge");
 
 module.exports = merge(common, {
     output: {

webpack.serve.js

 /* global module */
-const merge = require("webpack-merge");
-const common = require("./webpack.common.js");
 const HTMLWebpackPlugin = require('html-webpack-plugin');
+const common = require("./webpack.common.js");
+const { merge } = require("webpack-merge");
 
 module.exports = merge(common, {
     mode: "development",