Change node label for Mac/iOS for new AMI update (#1086)

Changes the default node label for Mac/iOS to the newest AMI

- This AMI contains updates for XCode and CMake
- CMake is now on 3.20.2

scripts/build/Platform/Mac/pipeline.json

@@ -1,6 +1,6 @@
 {
     "ENV": {
-        "NODE_LABEL": "mac",
+        "NODE_LABEL": "mac-catalina-7ad2e45b",
         "LY_3RDPARTY_PATH": "/Users/lybuilder/3rdParty",
         "TIMEOUT": 30,
         "WORKSPACE": "/Users/lybuilder/workspace",

scripts/build/Platform/iOS/pipeline.json

@@ -1,6 +1,6 @@
 {
     "ENV": {
-        "NODE_LABEL": "mac",
+        "NODE_LABEL": "mac-catalina-7ad2e45b",
         "LY_3RDPARTY_PATH": "/Users/lybuilder/3rdParty",
         "TIMEOUT": 30,
         "WORKSPACE": "/Users/lybuilder/workspace",