analyzer_plugin: Bump analyzer dep

Change-Id: Id5c28292988dafd49ab952a676f5558303002be4
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/395600
Auto-Submit: Samuel Rawlins <[email protected]>
Commit-Queue: Brian Wilkerson <[email protected]>
Reviewed-by: Brian Wilkerson <[email protected]>

Author: srawlins

pkg/analyzer_plugin/pubspec.yaml

@@ -7,7 +7,7 @@ environment:
   sdk: '^3.0.0'
 
 dependencies:
-  analyzer: ^6.0.0
+  analyzer: ^7.0.0
   collection: ^1.15.0
   dart_style: '>=2.3.7 <4.0.0'
   meta: ^1.15.0