Add missing void annotation: refs #32161

Change-Id: Ifee22c00bd9384faef8ee48c1d7fd92879609ce4
Reviewed-on: https://dart-review.googlesource.com/42321
Commit-Queue: Mike Fairhurst <[email protected]>
Reviewed-by: Paul Berry <[email protected]>

Author: MichaelRFairhurst

pkg/analyzer/test/src/task/options_test.dart

@@ -46,7 +46,7 @@ class ContextConfigurationTest extends AbstractContextTest {
 
   AnalysisOptions get analysisOptions => context.analysisOptions;
 
-  configureContext(String optionsSource) =>
+  void configureContext(String optionsSource) =>
       applyToAnalysisOptions(analysisOptions, parseOptions(optionsSource));
 
   Map<String, YamlNode> parseOptions(String source) =>