This Might Fix your Problem if it Don't , Mention Your Unity Version and your Problem into Comments.
Unity Forum Page:
https://forum.unity.com/threads/issue-with-ironsource-sdk-resolving-android-dependencies-stuck-at-100.1523602/#post-9515800
Download IronSource Latest SDK:
https://developers.is.com/ironsource-mobile/unity/unity-plugin/#step-1
IronSource SDK Integration Page:
https://developers.is.com/ironsource-mobile/unity/unity-plugin/#step-4
Download Mobile Dependencies Manager:
https://github.com/googlesamples/unity-jar-resolver
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