deps: Upgrade Flutter to 3.28.0-2.0.pre.38575

And update Flutter's supporting libraries to match.

pubspec.lock

@@ -1004,10 +1004,10 @@ packages:
     dependency: transitive
     description:
       name: source_span
-      sha256: "53e943d4206a5e30df338fd4c6e7a077e02254531b138a15aec3bd143c1a8b3c"
+      sha256: "254ee5351d6cb365c859e20ee823c3bb479bf4a293c22d17a9f1bf144ce86f7c"
       url: "https://pub.dev"
     source: hosted
-    version: "1.10.0"
+    version: "1.10.1"
   sprintf:
     dependency: transitive
     description:
@@ -1092,26 +1092,26 @@ packages:
     dependency: "direct dev"
     description:
       name: test
-      sha256: "713a8789d62f3233c46b4a90b174737b2c04cb6ae4500f2aa8b1be8f03f5e67f"
+      sha256: "8391fbe68d520daf2314121764d38e37f934c02fd7301ad18307bd93bd6b725d"
       url: "https://pub.dev"
     source: hosted
-    version: "1.25.8"
+    version: "1.25.14"
   test_api:
     dependency: "direct dev"
     description:
       name: test_api
-      sha256: "664d3a9a64782fcdeb83ce9c6b39e78fd2971d4e37827b9b06c3aa1edc5e760c"
+      sha256: fb31f383e2ee25fbbfe06b40fe21e1e458d14080e3c67e7ba0acfde4df4e0bbd
       url: "https://pub.dev"
     source: hosted
-    version: "0.7.3"
+    version: "0.7.4"
   test_core:
     dependency: transitive
     description:
       name: test_core
-      sha256: "12391302411737c176b0b5d6491f466b0dd56d4763e347b6714efbaa74d7953d"
+      sha256: "84d17c3486c8dfdbe5e12a50c8ae176d15e2a771b96909a9442b40173649ccaa"
       url: "https://pub.dev"
     source: hosted
-    version: "0.6.5"
+    version: "0.6.8"
   timing:
     dependency: transitive
     description:
@@ -1368,5 +1368,5 @@ packages:
     source: path
     version: "0.0.1"
 sdks:
-  dart: ">=3.7.0-224.0.dev <4.0.0"
-  flutter: ">=3.28.0-1.0.pre.35"
+  dart: ">=3.7.0-267.0.dev <4.0.0"
+  flutter: ">=3.28.0-2.0.pre.38575"

pubspec.yaml

@@ -14,8 +14,8 @@ environment:
   # We use a recent version of Flutter from its main channel, and
   # the corresponding recent version of the Dart SDK.
   # Feel free to update these regularly; see README.md for instructions.
-  sdk: '>=3.7.0-224.0.dev <4.0.0'
-  flutter: '>=3.28.0-1.0.pre.35'  # 1c1f35711be76d1d2a9f5e3a730747591e64e14a
+  sdk: '>=3.7.0-267.0.dev <4.0.0'
+  flutter: '>=3.28.0-2.0.pre.38575'  # 65ff060283e19423e9538c18c24e44495b70aeff
 
 # To update dependencies, see instructions in README.md.
 dependencies: