Update autofill to 18.4.0 (#6884)

Task/Issue URL:
https://app.asana.com/1/137249556945/task/1211543805495085
Autofill Release:
https://github.com/duckduckgo/duckduckgo-autofill/releases/tag/18.4.0


## Description
Updates Autofill to version
[18.4.0](https://github.com/duckduckgo/duckduckgo-autofill/releases/tag/18.4.0).

### Autofill 18.4.0 release notes
## What's Changed
* Update password-related json files by @daxmobile in
duckduckgo/duckduckgo-autofill#900
* [SiteSpecificFixes] Allow forcing unknown input type by @dbajpeyi in
duckduckgo/duckduckgo-autofill#903
* [InterfacePrototype] Get rid of `GetIdentity(id)` call on Windows by
@dbajpeyi in duckduckgo/duckduckgo-autofill#904
* Update password-related json files by @daxmobile in
duckduckgo/duckduckgo-autofill#902
* Update password-related json files by @daxmobile in
duckduckgo/duckduckgo-autofill#908


**Full Changelog**:
duckduckgo/duckduckgo-autofill@18.3.1...18.4.0

## Steps to test
This release has been tested during autofill development. For smoke test
steps see [this
task](https://app.asana.com/0/1198964220583541/1200583647142330/f).

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

Author: daxmobile

node_modules/@duckduckgo/autofill/dist/autofill-debug.js

@@ -14,7 +14,7 @@
   },
   "dependencies": {
     "@duckduckgo/autoconsent": "^14.19.0",
-    "@duckduckgo/autofill": "github:duckduckgo/duckduckgo-autofill#18.3.1",
+    "@duckduckgo/autofill": "github:duckduckgo/duckduckgo-autofill#18.4.0",
     "@duckduckgo/content-scope-scripts": "github:duckduckgo/content-scope-scripts#11.32.0",
     "@duckduckgo/privacy-dashboard": "github:duckduckgo/privacy-dashboard#9.0.0",
     "@duckduckgo/privacy-reference-tests": "github:duckduckgo/privacy-reference-tests#1758095627"