Increase iOS deployment target from 10 to 12.

TBR=kthelgason@webrtc.org

Bug: webrtc:12928
Change-Id: I50de09972bf012e78a9bc9f1d98d8d07aab4e180
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/224543
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Peter Hanspers <peterhanspers@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34409}
diff --git a/sdk/objc/unittests/RTCAudioSessionTest.mm b/sdk/objc/unittests/RTCAudioSessionTest.mm
index 805f601..e2c2663 100644
--- a/sdk/objc/unittests/RTCAudioSessionTest.mm
+++ b/sdk/objc/unittests/RTCAudioSessionTest.mm
@@ -230,7 +230,7 @@
     __autoreleasing NSError **retError;
     [invocation getArgument:&retError atIndex:4];
     *retError = [NSError errorWithDomain:@"AVAudioSession"
-                                    code:AVAudioSessionErrorInsufficientPriority
+                                    code:AVAudioSessionErrorCodeCannotInterruptOthers
                                 userInfo:nil];
     BOOL failure = NO;
     [invocation setReturnValue:&failure];