[js_shared] Update pubspec to 3.8 and reformat.

Change-Id: Ifb1e56982515e9e6b5d344749357e5bfb5641bfc
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/427566
Commit-Queue: Nate Biggs <natebiggs@google.com>
Auto-Submit: Mayank Patke <fishythefish@google.com>
Reviewed-by: Nate Biggs <natebiggs@google.com>

pkg/js_shared/pubspec.yaml

@@ -3,7 +3,7 @@ name: js_shared
 publish_to: none
 
 environment:
-  sdk: ^3.5.0
+  sdk: ^3.8.0
 
 resolution: workspace
 

pkg/js_shared/test/in_sync_test.dart

@@ -12,28 +12,37 @@ import 'package:expect/expect.dart';
 
 void main(List<String> argv) {
   var packageDir = Platform.script.resolve('../lib/synced/');
-  var sdkDir = Platform.script
-      .resolve('../../../sdk/lib/_internal/js_shared/lib/synced/');
-  var rPackageDir =
-      relativizeUri(Directory.current.uri, packageDir, Platform.isWindows);
-  var rSdkDir =
-      relativizeUri(Directory.current.uri, sdkDir, Platform.isWindows);
+  var sdkDir = Platform.script.resolve(
+    '../../../sdk/lib/_internal/js_shared/lib/synced/',
+  );
+  var rPackageDir = relativizeUri(
+    Directory.current.uri,
+    packageDir,
+    Platform.isWindows,
+  );
+  var rSdkDir = relativizeUri(
+    Directory.current.uri,
+    sdkDir,
+    Platform.isWindows,
+  );
 
   for (var file in Directory.fromUri(sdkDir).listSync()) {
     if (file is File) {
       var filename = file.uri.pathSegments.last;
       var packageFile = File.fromUri(packageDir.resolve(filename));
       Expect.isTrue(
-          packageFile.existsSync(),
-          "$filename not in sync. Please update it by running:\n"
-          "  cp $rSdkDir$filename $rPackageDir$filename");
+        packageFile.existsSync(),
+        "$filename not in sync. Please update it by running:\n"
+        "  cp $rSdkDir$filename $rPackageDir$filename",
+      );
       var original = file.readAsBytesSync();
       var copy = packageFile.readAsBytesSync();
       Expect.listEquals(
-          original,
-          copy,
-          "$filename not in sync. Please update it by running:\n"
-          "  cp $rSdkDir$filename $rPackageDir$filename");
+        original,
+        copy,
+        "$filename not in sync. Please update it by running:\n"
+        "  cp $rSdkDir$filename $rPackageDir$filename",
+      );
     }
   }
 }