[dart2js_tools] Update pubspec to 3.8 and reformat.

Change-Id: I8216c8d0bcbaf2b9fe6aecb256b9a3f9d5efc47a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/427562
Auto-Submit: Mayank Patke <[email protected]>
Reviewed-by: Nate Biggs <[email protected]>
Commit-Queue: Nate Biggs <[email protected]>

Author: fishythefish

pkg/dart2js_tools/lib/src/dart2js_mapping.dart

@@ -125,10 +125,9 @@ class _FrameDecoder implements Iterator<String> {
   bool moveNext() => ++index < _length;
 
   @override
-  String get current =>
-      (index >= 0 && index < _length)
-          ? _internal[index]
-          : throw StateError('No current value available.');
+  String get current => (index >= 0 && index < _length)
+      ? _internal[index]
+      : throw StateError('No current value available.');
 
   bool get hasTokens => index < _length - 1 && _length > 0;
 

pkg/dart2js_tools/pubspec.yaml

@@ -6,7 +6,7 @@ description: >
   information, deobfuscation of stack-traces and minified names.
 
 environment:
-  sdk: '^3.7.0'
+  sdk: '^3.8.0'
 
 resolution: workspace