Use iOS 17.5.1 for perf

Bug: b/346224942
Change-Id: I853184db7c825f61994dc04f498118de50001feb
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/354740
Reviewed-by: Jeremy Leconte <jleconte@webrtc.org>
Commit-Queue: Christoffer Dewerin <jansson@google.com>
Cr-Commit-Position: refs/heads/main@{#42485}

infra/specs/internal.client.webrtc.json

@@ -435,8 +435,7 @@
           ],
           "dimensions": {
             "cpu": "arm64",
-            "id": "mac-438-e504",
-            "os": "iOS-17.4.1",
+            "os": "iOS-17.5.1",
             "pool": "WebRTC"
           },
           "hard_timeout": 10800,

infra/specs/mixins.pyl

@@ -77,9 +77,8 @@
     'swarming': {
       'idempotent': False,
       'dimensions': {
-        'os': 'iOS-17.4.1',
-        'pool': 'WebRTC',
-        'id': 'mac-438-e504'
+        'os': 'iOS-17.5.1',
+        'pool': 'WebRTC'
       }
     }
   },

infra/specs/mixins_webrtc.pyl

@@ -51,9 +51,8 @@
     'swarming': {
       'idempotent': False,
       'dimensions': {
-        'os': 'iOS-17.4.1',
+        'os': 'iOS-17.5.1',
         'pool': 'WebRTC',
-        'id': 'mac-438-e504',
         #'device_status': 'available'
       },
     },