update-checkout-config: Sync rebranch and next revisions of swift-argument-parser and mimalloc with main

Author: AnthonyLatsis

utils/update_checkout/update-checkout-config.json

@@ -458,7 +458,7 @@
                 "swift-toolchain-sqlite": "1.0.1",
                 "swift-tools-support-core": "main",
                 "swiftpm": "main",
-                "swift-argument-parser": "1.4.0",
+                "swift-argument-parser": "1.5.1",
                 "swift-atomics": "1.2.0",
                 "swift-collections": "1.1.5",
                 "swift-crypto": "3.12.5",
@@ -498,7 +498,7 @@
                 "curl": "curl-8_9_1",
                 "libxml2": "v2.11.5",
                 "zlib": "v1.3.1",
-                "mimalloc": "v3.0.1",
+                "mimalloc": "v3.0.3",
                 "swift-subprocess": "development-snapshot-2025-07-21"
             }
         },
@@ -516,7 +516,7 @@
                 "swift-toolchain-sqlite": "1.0.1",
                 "swift-tools-support-core": "main",
                 "swiftpm": "main",
-                "swift-argument-parser": "1.4.0",
+                "swift-argument-parser": "1.5.1",
                 "swift-async-algorithms": "1.0.1",
                 "swift-atomics": "1.2.0",
                 "swift-collections": "1.1.5",
@@ -549,7 +549,7 @@
                 "curl": "curl-8_9_1",
                 "libxml2": "v2.11.5",
                 "zlib": "v1.3.1",
-                "mimalloc": "v3.0.1",
+                "mimalloc": "v3.0.3",
                 "swift-subprocess": "development-snapshot-2025-07-21"
             }
         }