Updating Pubmatic Android adapter version to 4.9.1.0

PiperOrigin-RevId: 812789634

Author: Mobile Ads Developer Relations

ThirdPartyAdapters/pubmatic/CHANGELOG.md

@@ -1,6 +1,11 @@
 ## PubMatic Android Mediation Adapter Changelog
 
-#### Version 4.9.1.0 (In progress)
+#### Version 4.9.1.0
+- Verified compatibility with Pubmatic SDK 4.9.1.
+
+Built and tested with:
+- Google Mobile Ads SDK version 24.6.0.
+- Pubmatic SDK version 4.9.1
 
 #### Version 4.8.0.1
 - Adds support for waterfall interstitial ads.