chore(deps-dev): bump @rollup/plugin-json from 4.1.0 to 6.0.0

Bumps [@rollup/plugin-json](https://github.com/rollup/plugins/tree/HEAD/packages/json) from 4.1.0 to 6.0.0.
- [Release notes](https://github.com/rollup/plugins/releases)
- [Changelog](https://github.com/rollup/plugins/blob/master/packages/json/CHANGELOG.md)
- [Commits](https://github.com/rollup/plugins/commits/url-v6.0.0/packages/json)

---
updated-dependencies:
- dependency-name: "@rollup/plugin-json"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -32,7 +32,7 @@
     "@nrk/custom-element-to-react": "1.1.1",
     "@rollup/plugin-babel": "6.0.3",
     "@rollup/plugin-commonjs": "22.0.2",
-    "@rollup/plugin-json": "4.1.0",
+    "@rollup/plugin-json": "6.0.0",
     "@rollup/plugin-node-resolve": "15.0.1",
     "@webcomponents/custom-elements": "1.5.0",
     "axios": "1.2.2",