feat: add filament 4.x support for mansoor-unsplash-picker plugin

Author: mansoorkhan96

content/plugins/images/mansoor-unsplash-picker.jpg

@@ -5,10 +5,12 @@ author_slug: mansoor
 categories: [panel-builder, form-builder, action]
 description: Unsplash gallery. Search and pick any image from Unsplash.com
 discord_url: https://discord.com/channels/883083792112300104/1224005074393497680
-docs_url: https://raw.githubusercontent.com/mansoorkhan96/filament-unsplash-picker/main/README.md
+docs_urls:
+    v3: https://raw.githubusercontent.com/mansoorkhan96/filament-unsplash-picker/3.x/README.md
+    v4: https://raw.githubusercontent.com/mansoorkhan96/filament-unsplash-picker/4.x/README.md
 github_repository: mansoorkhan96/filament-unsplash-picker
 has_dark_theme: true
 has_translations: true
-versions: [3]
+versions: [3, 4]
 publish_date: 2024-03-31
 ---