Update extension-manager.md

Author: ivan-hc

apps/extension-manager.md

@@ -20,7 +20,7 @@ If there's something you'd like to see, contributions are welcome!
 
  SITE:https://github.com/mjakeman/extension-manager
 
- SOURCE: https://github.com/Shikakiben/Extension-Manager-AppImage
+ SOURCE: https://github.com/pkgforge-dev/Extension-Manager-AppImage
 
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