[infra] Fix utility used when bisecting CI failures

The bisection capability for failing builds on the CI is not much
used, and it is failing when updating the build information in Firestore.

A simple error in the script is causing the current error, so
this CL fixes a simple error in tools/bots/update_blamelists.dart.

Bug: #51978
Change-Id: Iba71e6115427145d20458d9e56f4cfa73fa232c9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/302923
Auto-Submit: William Hesse <[email protected]>
Commit-Queue: Jonas Termansen <[email protected]>
Reviewed-by: Jonas Termansen <[email protected]>

Author: whesse

tools/bots/update_blamelists.dart

@@ -95,7 +95,7 @@ bool shouldUpdateRecord(ResultRecord resultRecord, Result? testResult) {
   return true;
 }
 
-void updateBlameLists(String configuration, String commit,
+Future<void> updateBlameLists(String configuration, String commit,
     Map<String, Map<String, dynamic>> testResults) async {
   int commitIndex = await getCommitIndex(commit);
   var query = unapprovedActiveFailuresQuery(configuration);
@@ -179,6 +179,6 @@ main(List<String> arguments) async {
   var project = options['staging'] ? 'dart-ci-staging' : 'dart-ci';
   database = FirestoreDatabase(
       project, await readGcloudAuthToken(options['auth-token']));
-  updateBlameLists(configuration, commit, results);
+  await updateBlameLists(configuration, commit, results);
   database.closeClient();
 }