Prepare for publishing analyzer 0.27.4-alpha.11

I think the new trackCacheDependencies option might be interesting for
DDC to use.

[email protected]
BUG=

Review URL: https://codereview.chromium.org/2061463002 .

Author: scheglov

pkg/analyzer/pubspec.yaml

@@ -1,5 +1,5 @@
 name: analyzer
-version: 0.27.4-alpha.10
+version: 0.27.4-alpha.11
 author: Dart Team <[email protected]>
 description: Static analyzer for Dart.
 homepage: https://github.com/dart-lang/sdk/tree/master/pkg/analyzer