Update content scope scripts to version 5.21.0 (#4655)

Task/Issue URL:
https://app.asana.com/0/488551667048375/1207578347439866/f

 ----- 
- Automated content scope scripts dependency update

This PR updates the content scope scripts dependency to the latest
available version and copies the necessary files.
If tests have failed, see
https://app.asana.com/0/1202561462274611/1203986899650836/f for further
information on what to do next.

- [ ] All tests must pass

Co-authored-by: daxmobile <[email protected]>

Author: daxmobile

package-lock.json

@@ -16,7 +16,7 @@
   "dependencies": {
     "@duckduckgo/autoconsent": "^10.10.0",
     "@duckduckgo/autofill": "github:duckduckgo/duckduckgo-autofill#10.2.0",
-    "@duckduckgo/content-scope-scripts": "github:duckduckgo/content-scope-scripts#5.19.0",
+    "@duckduckgo/content-scope-scripts": "github:duckduckgo/content-scope-scripts#5.21.0",
     "@duckduckgo/privacy-dashboard": "github:duckduckgo/privacy-dashboard#3.5.0",
     "@duckduckgo/privacy-reference-tests": "github:duckduckgo/privacy-reference-tests#1708702034"
   }