Prepare to publish analyzer 6.6.0 and _fe_analyzer_shared 71.0.0

Bug: https://github.com/dart-lang/sdk/issues/55870
Change-Id: Ic06f4c0a2cc5dc5f07f72335dd172f203b948cb1
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/371261
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>

pkg/_fe_analyzer_shared/pubspec.yaml

@@ -1,5 +1,5 @@
 name: _fe_analyzer_shared
-version: 70.0.0
+version: 71.0.0
 description: Logic that is shared between the front_end and analyzer packages.
 repository: https://github.com/dart-lang/sdk/tree/main/pkg/_fe_analyzer_shared
 

pkg/analyzer/CHANGELOG.md

@@ -1,4 +1,4 @@
-## 6.6.0-dev
+## 6.6.0
 * Stop exporting `src/file_system/file_system.dart`
   from `file_system/file_system.dart`.
 * Deprecated `package:analyzer/src/source/source_resource.dart`,

pkg/analyzer/pubspec.yaml

@@ -1,5 +1,5 @@
 name: analyzer
-version: 6.6.0-dev
+version: 6.6.0
 description: >-
   This package provides a library that performs static analysis of Dart code.
 repository: https://github.com/dart-lang/sdk/tree/main/pkg/analyzer
@@ -8,7 +8,7 @@ environment:
   sdk: '>=3.3.0 <4.0.0'
 
 dependencies:
-  _fe_analyzer_shared: ^70.0.0
+  _fe_analyzer_shared: ^71.0.0
   collection: ^1.17.0
   convert: ^3.0.0
   crypto: ^3.0.0