chore(deps): update dependency @rollup/plugin-url to v6

This MR contains the following updates:

Package	Type	Update	Change
@rollup/plugin-url	devDependencies	major	^5.0.1 -> ^6.0.0

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packages/knowledge-base-web-page-element-view/package.json

@@ -5,8 +5,8 @@
   "main": "src/index.js",
   "license": "LGPL-2.1-or-later",
   "repository": {
-    "type" : "git",
-    "url" : "https://gitlab.tugraz.at/dbp/web-components/toolkit.git",
+    "type": "git",
+    "url": "https://gitlab.tugraz.at/dbp/web-components/toolkit.git",
     "directory": "packages/knowledge-base-web-page-element-view"
   },
   "publishConfig": {
@@ -19,6 +19,8 @@
     "@rollup/plugin-node-resolve": "^10.0.0",
     "@rollup/plugin-url": "^6.0.0",
     "chai": "^4.2.0",
+    "eslint": "^7.3.1",
+    "eslint-plugin-jsdoc": "^30.6.4",
     "karma": "^5.1.0",
     "karma-chrome-launcher": "^3.0.0",
     "karma-firefox-launcher": "^2.1.0",
@@ -28,11 +30,8 @@
     "rollup-plugin-consts": "^1.0.1",
     "rollup-plugin-copy": "^3.1.0",
     "rollup-plugin-delete": "^2.0.0",
-    "rollup-plugin-postcss": "^3.1.2",
     "rollup-plugin-serve": "^1.0.1",
-    "rollup-plugin-terser": "^7.0.2",
-    "eslint": "^7.3.1",
-    "eslint-plugin-jsdoc": "^30.6.4"
+    "rollup-plugin-terser": "^7.0.2"
   },
   "dependencies": {
     "@dbp-toolkit/auth": "^0.1.0",