Update all dependencies

Author: renovate-bot

package.json

@@ -21,7 +21,7 @@
     "@lrnwebcomponents/learn-two-theme": "^2.1.3",
     "@lrnwebcomponents/outline-player": "^2.1.2",
     "@lrnwebcomponents/simple-blog": "^2.1.3",
-    "@webcomponents/webcomponentsjs": "2.2.10",
+    "@webcomponents/webcomponentsjs": "2.4.0",
     "lunr": "^2.3.6",
     "web-animations-js": "^2.3.1"
   },
@@ -45,7 +45,7 @@
     "@polymer/app-layout": "3.0.2",
     "schema-utils": "1.0.0",
     "@lrnwebcomponents/hax-body-behaviors": "2.1.2",
-    "@webcomponents/webcomponentsjs": "2.2.10",
+    "@webcomponents/webcomponentsjs": "2.4.0",
     "@polymer/iron-list": "3.0.2",
     "@polymer/paper-icon-button": "3.0.1",
     "@polymer/paper-input": "3.0.2",

system/boilerplate/site/package.json

@@ -96,7 +96,7 @@
     "@polymer/polymer": "^3.1.0",
     "@vaadin/vaadin-split-layout": "^4.1.0",
     "@vaadin/vaadin-upload": "^4.2.1",
-    "@webcomponents/webcomponentsjs": "2.2.10",
+    "@webcomponents/webcomponentsjs": "2.4.0",
     "paper-collapse-item": "^4.0.4",
     "web-animations-js": "^2.3.1"
   },

vendor/ralouphie/getallheaders/composer.json

@@ -12,7 +12,7 @@
 		"php": ">=5.3"
 	},
 	"require-dev": {
-		"phpunit/phpunit": "~8.3.0",
+		"phpunit/phpunit": "~8.4.0",
 		"satooshi/php-coveralls": ">=1.0"
 	},
 	"autoload": {