Bump various dependencies

package.json

@@ -58,10 +58,10 @@
   "devDependencies": {
     "@babel/cli": "^7.8.4",
     "@babel/core": "^7.9.0",
-    "@babel/plugin-proposal-nullish-coalescing-operator": "^7.8.3",
+    "@babel/plugin-proposal-nullish-coalescing-operator": "^7.10.1",
     "@babel/plugin-proposal-optional-chaining": "^7.9.0",
     "@babel/plugin-syntax-dynamic-import": "^7.2.0",
-    "@babel/preset-env": "^7.9.5",
+    "@babel/preset-env": "^7.10.2",
     "@converse/headless": "file:src/headless",
     "@fortawesome/fontawesome-free": "5.13.0",
     "autoprefixer": "^9.7.6",
@@ -93,7 +93,7 @@
     "karma-jasmine": "^3.1.1",
     "karma-jasmine-html-reporter": "^1.5.3",
     "karma-webpack": "^4.0.2",
-    "lerna": "^3.22.0",
+    "lerna": "^3.22.1",
     "lit-element": "^2.3.1",
     "lit-html": "^1.2.1",
     "lodash-template-webpack-loader": "jcbrand/lodash-template-webpack-loader",
@@ -110,7 +110,7 @@
     "sass-loader": "^8.0.2",
     "sinon": "^9.0.2",
     "sizzle": "^2.3.5",
-    "style-loader": "^0.23.1",
+    "style-loader": "^1.2.1",
     "urijs": "^1.19.2",
     "webpack": "^4.43.0",
     "webpack-cli": "^3.3.11",