Prepare for release 2.55.0 (#9663)

flutter-candidate.txt

diff --git a/flutter-candidate.txt b/flutter-candidate.txt
index b8f91c9..f32407a 100644
--- a/flutter-candidate.txt
+++ b/flutter-candidate.txt
@@ -1 +1 @@
-71348e7b2b1b64e425fa0a3733f27d2b94ca7847
+5f49837cddf55149ed9af642a80a2bb45b0149ec

packages/devtools_app/benchmark/web_bundle_size_test.dart

diff --git a/packages/devtools_app/benchmark/web_bundle_size_test.dart b/packages/devtools_app/benchmark/web_bundle_size_test.dart
index ac5a8a0..1e17beb 100644
--- a/packages/devtools_app/benchmark/web_bundle_size_test.dart
+++ b/packages/devtools_app/benchmark/web_bundle_size_test.dart
@@ -11,7 +11,7 @@
 import 'package:test/test.dart';
 
 // Benchmark size in kB.
-const bundleSizeBenchmark = 5500;
+const bundleSizeBenchmark = 5550;
 const gzipBundleSizeBenchmark = 1650;
 
 void main() {

packages/devtools_app/lib/devtools.dart

diff --git a/packages/devtools_app/lib/devtools.dart b/packages/devtools_app/lib/devtools.dart
index 6ac7b74..15fcb1d 100644
--- a/packages/devtools_app/lib/devtools.dart
+++ b/packages/devtools_app/lib/devtools.dart
@@ -10,4 +10,4 @@
 /// Note: a regexp in the `dt update-version' command logic matches the constant
 /// declaration `const version =`. If you change the declaration you must also
 /// modify the regex in the `dt update-version' command logic.
-const version = '2.55.0-dev.0';
+const version = '2.55.0';

packages/devtools_app/lib/src/shared/primitives/custom_pointer_scroll_view.dart

diff --git a/packages/devtools_app/lib/src/shared/primitives/custom_pointer_scroll_view.dart b/packages/devtools_app/lib/src/shared/primitives/custom_pointer_scroll_view.dart
index eb0e45f..f6cc1b5 100644
--- a/packages/devtools_app/lib/src/shared/primitives/custom_pointer_scroll_view.dart
+++ b/packages/devtools_app/lib/src/shared/primitives/custom_pointer_scroll_view.dart
@@ -31,7 +31,7 @@
     super.physics,
     super.shrinkWrap,
     super.padding,
-    super.cacheExtent,
+    super.scrollCacheExtent,
     super.semanticChildCount,
     super.dragStartBehavior,
     this.customPointerSignalHandler,

packages/devtools_app/pubspec.yaml

diff --git a/packages/devtools_app/pubspec.yaml b/packages/devtools_app/pubspec.yaml
index ebd0887..90fdb87 100644
--- a/packages/devtools_app/pubspec.yaml
+++ b/packages/devtools_app/pubspec.yaml
@@ -7,7 +7,7 @@
 
 # Note: this version should only be updated by running the 'dt update-version'
 # command that updates the version here and in 'devtools.dart'.
-version: 2.55.0-dev.0
+version: 2.55.0
 
 repository: https://github.com/flutter/devtools/tree/master/packages/devtools_app
 
@@ -36,7 +36,7 @@
   flutter_web_plugins:
     sdk: flutter
   http: ^1.1.0
-  image: ^4.1.3
+  image: ^4.7.2
   intl: ^0.19.0
   json_rpc_2: ^3.0.2
   logging: ^1.1.1

pubspec.lock

diff --git a/pubspec.lock b/pubspec.lock
index 7127d25..180e37a 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -437,10 +437,10 @@
     dependency: transitive
     description:
       name: image
-      sha256: "4e973fcf4caae1a4be2fa0a13157aa38a8f9cb049db6529aa00b4d71abc4d928"
+      sha256: "492bd52f6c4fbb6ee41f781ff27765ce5f627910e1e0cbecfa3d9add5562604c"
       url: "https://pub.dev"
     source: hosted
-    version: "4.5.4"
+    version: "4.7.2"
   integration_test:
     dependency: transitive
     description: flutter
@@ -546,10 +546,10 @@
     dependency: transitive
     description:
       name: meta
-      sha256: "23f08335362185a5ea2ad3a4e597f1375e78bce8a040df5c600c8d3552ef2394"
+      sha256: "1741988757a65eb6b36abe716829688cf01910bbf91c34354ff7ec1c3de2b349"
       url: "https://pub.dev"
     source: hosted
-    version: "1.17.0"
+    version: "1.18.0"
   mime:
     dependency: transitive
     description:
@@ -854,26 +854,26 @@
     dependency: transitive
     description:
       name: test
-      sha256: "77cc98ea27006c84e71a7356cf3daf9ddbde2d91d84f77dbfe64cf0e4d9611ae"
+      sha256: "54c516bbb7cee2754d327ad4fca637f78abfc3cbcc5ace83b3eda117e42cd71a"
       url: "https://pub.dev"
     source: hosted
-    version: "1.28.0"
+    version: "1.29.0"
   test_api:
     dependency: transitive
     description:
       name: test_api
-      sha256: "19a78f63e83d3a61f00826d09bc2f60e191bf3504183c001262be6ac75589fb8"
+      sha256: "93167629bfc610f71560ab9312acdda4959de4df6fac7492c89ff0d3886f6636"
       url: "https://pub.dev"
     source: hosted
-    version: "0.7.8"
+    version: "0.7.9"
   test_core:
     dependency: transitive
     description:
       name: test_core
-      sha256: f1072617a6657e5fc09662e721307f7fb009b4ed89b19f47175d11d5254a62d4
+      sha256: "394f07d21f0f2255ec9e3989f21e54d3c7dc0e6e9dbce160e5a9c1a6be0e2943"
       url: "https://pub.dev"
     source: hosted
-    version: "0.6.14"
+    version: "0.6.15"
   typed_data:
     dependency: transitive
     description: