Update perf dimensions

Bug: b/299058719
Change-Id: I887886adb020af9eda26dcee862100a70d156d84
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/319400
Commit-Queue: Christoffer Jansson <jansson@google.com>
Reviewed-by: Jeremy Leconte <jleconte@google.com>
Cr-Commit-Position: refs/heads/main@{#40715}

infra/specs/internal.client.webrtc.json

@@ -447,7 +447,7 @@
           "--write_perf_output_on_ios",
           "--xctest",
           "--xcode-build-version",
-          "13c100",
+          "14c18",
           "--out-dir",
           "${ISOLATED_OUTDIR}",
           "--nologs"
@@ -475,7 +475,7 @@
           ],
           "dimensions": {
             "id": "mac-254-e504",
-            "os": "iOS-12.4.1",
+            "os": "iOS-15.7.8",
             "pool": "WebRTC"
           },
           "hard_timeout": 10800,
@@ -483,7 +483,7 @@
           "io_timeout": 10800,
           "named_caches": [
             {
-              "name": "xcode_ios_13c100",
+              "name": "xcode_ios_14c18",
               "path": "Xcode.app"
             }
           ],

infra/specs/mixins.pyl

@@ -76,7 +76,7 @@
     'swarming': {
       'idempotent': False,
       'dimensions': {
-        'os': 'iOS-12.4.1',
+        'os': 'iOS-15.7.8',
         'pool': 'WebRTC',
         'id': 'mac-254-e504'
       }

infra/specs/mixins_webrtc.pyl

@@ -56,7 +56,7 @@
     'swarming': {
       'idempotent': False,
       'dimensions': {
-        'os': 'iOS-12.4.1',
+        'os': 'iOS-15.7.8',
         'pool': 'WebRTC',
         'id': 'mac-254-e504',
       },

infra/specs/waterfalls.pyl

@@ -335,7 +335,7 @@
       'iOS64 Perf': {
         'mixins': [
           'ios-device-perf', 'webrtc-xctest', 'timeout-3h',
-          'chrome-tester-service-account', 'xcode_13_main', 'mac_toolchain',
+          'chrome-tester-service-account', 'xcode_14_main', 'mac_toolchain',
           'has_native_resultdb_integration', 'out_dir_arg'
         ],
         'test_suites': {