Bump analyzer version used in plugins

Change-Id: I409bab47add37b51e676fc39286244aae554a4fa
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/409780
Reviewed-by: Brian Wilkerson <[email protected]>
Commit-Queue: Samuel Rawlins <[email protected]>

Author: srawlins

pkg/analysis_server/lib/src/plugin2/analyzer_version.g.dart

@@ -13,4 +13,4 @@ var analyzerPluginVersion = '0.13.0';
 
 /// The version of the analyzer package that matches the analyzer code used by
 /// the analysis_server package.
-var analyzerVersion = '7.2.0';
+var analyzerVersion = '7.3.0';