Prepare for release 2.37.0 (#8007)

flutter-candidate.txt

diff --git a/flutter-candidate.txt b/flutter-candidate.txt
index d97ed57..ac2c36a 100644
--- a/flutter-candidate.txt
+++ b/flutter-candidate.txt
@@ -1 +1 @@
-1c77696615558bf8f9fa7a6e2a473f438f1c03ca
+3.23.0-13.0.pre

packages/devtools_app/lib/devtools.dart

diff --git a/packages/devtools_app/lib/devtools.dart b/packages/devtools_app/lib/devtools.dart
index e2e0cfd..f1829d8 100644
--- a/packages/devtools_app/lib/devtools.dart
+++ b/packages/devtools_app/lib/devtools.dart
@@ -9,4 +9,4 @@
 // the constant declaration `const version =`.
 // If you change the declaration you must also modify the regex in
 // tools/update_version.dart.
-const version = '2.37.0-dev.13';
+const version = '2.37.0';

packages/devtools_app/pubspec.yaml

diff --git a/packages/devtools_app/pubspec.yaml b/packages/devtools_app/pubspec.yaml
index 9169678..1700095 100644
--- a/packages/devtools_app/pubspec.yaml
+++ b/packages/devtools_app/pubspec.yaml
@@ -4,7 +4,7 @@
 
 # Note: this version should only be updated by running tools/update_version.dart
 # that updates all versions of devtools packages (devtools_app, devtools_test).
-version: 2.37.0-dev.13
+version: 2.37.0
 
 repository: https://github.com/flutter/devtools/tree/master/packages/devtools_app