migrate fixtures/_testSound and _webdevSmoke (#1653)

Author: jacob314

fixtures/_testPackage/pubspec.yaml

@@ -2,6 +2,9 @@ name: _test_package
 version: 1.0.0
 description: >-
   A fake package used for testing imports. Imports _test.
+  This code is for testing that debugger works with weak null safety so we
+  should not migrate it to null safety. Once Dart 3.0 is released, we should
+  delete this directory.
 publish_to: none
 
 environment:

fixtures/_testPackageSound/pubspec.yaml

@@ -12,5 +12,5 @@ dependencies:
     path: ../_testSound
 
 dev_dependencies:
-  build_runner: ^2.0.0
-  build_web_compilers: ^3.0.0
+  build_runner: ^2.1.11
+  build_web_compilers: ^3.2.3

fixtures/_testSound/pubspec.yaml

@@ -8,9 +8,9 @@ environment:
   sdk: '>=2.13.0 <3.0.0'
 
 dependencies:
-  intl: ^0.17.0-nullsafety.2
-  path: ^1.6.1
+  intl: ^0.17.0
+  path: ^1.8.2
 
 dev_dependencies:
-  build_runner: ^2.0.0
-  build_web_compilers: ^3.0.0
+  build_runner: ^2.1.11
+  build_web_compilers: ^3.2.3

fixtures/_webdevSmoke/pubspec.yaml

@@ -1,5 +1,10 @@
 name: _webdev_smoke
-description: A test fixture for webdev testing.
+description:
+  A test fixture for webdev testing.
+  This code is for testing that debugger works with weak null safety so we
+  should not migrate it to null safety. Once Dart 3.0 is released, we should
+  delete this directory.
+
 
 # The versions in this pubspec should match the requirements
 # defined by webdev. That is the SDK constraint should be the