Update GMA SDK dependency to v23.6.0. #1172

Job	Run time
Build (java/advanced/APIDemo)	2m 39s
Build (java/advanced/InlineAdaptiveBannerExample)	2m 21s
Build (java/advanced/RewardedSSVExample)	6s
Build (kotlin/advanced/APIDemo)	3m 15s
Build (kotlin/advanced/InlineAdaptiveBannerExample)	8s
Build (kotlin/advanced/JetpackComposeDemo)	5s
Build (java/admob/AppOpenExample)	2m 25s
Build (java/admob/BannerExample)	2m 15s
Build (java/admob/FullScreenNativeExample)	2m 27s
Build (java/admob/InterstitialExample)	2m 22s
Build (java/admob/NativeAdvancedExample)	2m 21s
Build (java/admob/RewardedInterstitialExample)	3m 4s
Build (java/admob/RewardedVideoExample)	2m 15s
Build (kotlin/admob/AppOpenExample)	2m 54s
Build (kotlin/admob/BannerExample)	2m 47s
Build (kotlin/admob/InterstitialExample)	2m 50s
Build (kotlin/admob/NativeAdvancedExample)	2m 52s
Build (kotlin/admob/RewardedInterstitialExample)	2m 43s
Build (kotlin/admob/RewardedVideoExample)	2m 40s
Build (java/admanager/AppOpenExample)	2m 24s
Build (java/admanager/BannerExample)	2m 16s
Build (java/admanager/InterstitialExample)	2m 16s
Build (java/admanager/NativeAdsExample)	2m 18s
Build (java/admanager/RewardedInterstitialExample)	2m 24s
Build (java/admanager/RewardedVideoExample)	2m 10s
Build (kotlin/admanager/AppOpenExample)	2m 47s
Build (kotlin/admanager/BannerExample)	2m 42s
Build (kotlin/admanager/InterstitialExample)	2m 49s
Build (kotlin/admanager/NativeAdsExample)	2m 46s
Build (kotlin/admanager/RewardedInterstitialExample)	2m 50s
Build (kotlin/admanager/RewardedVideoExample)	2m 41s
	1h 12m 52s

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