Update swift-corelibs-foundation branch to main

Author: shahmishal

utils/update_checkout/update-checkout-config.json

@@ -66,9 +66,9 @@
                 "swift-argument-parser": "0.3.0",
                 "swift-driver": "main",
                 "swift-syntax": "main",
-                "swift-stress-tester": "master",
+                "swift-stress-tester": "main",
                 "swift-corelibs-xctest": "main",
-                "swift-corelibs-foundation": "master",
+                "swift-corelibs-foundation": "main",
                 "swift-corelibs-libdispatch": "master",
                 "swift-integration-tests": "master",
                 "swift-xcode-playground-support": "master",
@@ -98,7 +98,7 @@
                 "swift-syntax": "main",
                 "swift-stress-tester": "main",
                 "swift-corelibs-xctest": "main",
-                "swift-corelibs-foundation": "master",
+                "swift-corelibs-foundation": "main",
                 "swift-corelibs-libdispatch": "master",
                 "swift-integration-tests": "master",
                 "swift-xcode-playground-support": "master",
@@ -321,7 +321,7 @@
                 "swift-syntax": "main",
                 "swift-stress-tester": "main",
                 "swift-corelibs-xctest": "main",
-                "swift-corelibs-foundation": "master",
+                "swift-corelibs-foundation": "main",
                 "swift-corelibs-libdispatch": "master",
                 "swift-integration-tests": "master",
                 "swift-xcode-playground-support": "master",