chore(docs): Add ui dependencies to the docs theme (#1971)

The dependencies on `@apify/ui-library` and `@apify/ui-icons` were not
listed in `apify-docs-theme/package.json`, causing the newly added
`@apify/ui-icons` library to be missing when updating the theme in other
docs.

Issue introduced here: #1956
See this error:
https://github.com/apify/apify-client-js/actions/runs/18216304167/job/51866166008

Author: webrdaniel

apify-docs-theme/package.json

@@ -20,6 +20,8 @@
     },
     "dependencies": {
         "@apify/docs-search-modal": "^1.2.2",
+        "@apify/ui-library": "^1.97.2",
+        "@apify/ui-icons": "^1.19.0",
         "@docusaurus/theme-common": "^3.7.0",
         "@stackql/docusaurus-plugin-hubspot": "^1.1.0",
         "algoliasearch": "^5.19.0",