chore: upgrade rive-ios SPM to 6.15.2

Author: mfazekas

example/ios/Podfile.lock

@@ -1754,7 +1754,6 @@ PODS:
     - React-logger (= 0.79.2)
     - React-perflogger (= 0.79.2)
     - React-utils (= 0.79.2)
-  - RiveRuntime (6.13.0)
   - RNCAsyncStorage (2.2.0):
     - DoubleConversion
     - glog
@@ -1928,7 +1927,6 @@ PODS:
     - ReactCodegen
     - ReactCommon/turbomodule/bridging
     - ReactCommon/turbomodule/core
-    - RiveRuntime (= 6.13.0)
     - Yoga
   - RNWorklets (0.6.1):
     - DoubleConversion
@@ -2091,7 +2089,6 @@ DEPENDENCIES:
 
 SPEC REPOS:
   trunk:
-    - RiveRuntime
     - SocketRocket
 
 EXTERNAL SOURCES:
@@ -2325,12 +2322,11 @@ SPEC CHECKSUMS:
   ReactAppDependencyProvider: 04d5eb15eb46be6720e17a4a7fa92940a776e584
   ReactCodegen: c63eda03ba1d94353fb97b031fc84f75a0d125ba
   ReactCommon: 76d2dc87136d0a667678668b86f0fca0c16fdeb0
-  RiveRuntime: 903690a5ba698b2a7e8d462e8aa7ceeba862614c
   RNCAsyncStorage: a1c8cc8a99c32de1244a9cf707bf9d83d0de0f71
   RNCPicker: 28c076ae12a1056269ec0305fe35fac3086c477d
   RNGestureHandler: 6b39f4e43e4b3a0fb86de9531d090ff205a011d5
   RNReanimated: 66b68ebe3baf7ec9e716bd059d700726f250d344
-  RNRive: 08add229e4fb333530054c7ccf3223e4842c5624
+  RNRive: 50fa285317d244e1bb5993afdf63c5ba96312eee
   RNWorklets: b1faafefb82d9f29c4018404a0fb33974b494a7b
   SocketRocket: d4aabe649be1e368d1318fdf28a022d714d65748
   Yoga: 9f110fc4b7aa538663cba3c14cbb1c335f43c13f