chore: Update blunderbuss.yml (#8287)

The blunderbuss label needs to match the label specified in .github/auto-label.yaml

Author: averikitsch

.github/blunderbuss.yml

@@ -17,7 +17,7 @@ assign_issues:
 
 assign_issues_by:
 - labels:
-  - "api: asset"
+  - "api: cloudasset"
   to:
   - GoogleCloudPlatform/cloud-asset-analysis-team
   - GoogleCloudPlatform/cloud-asset-platform-team
@@ -64,7 +64,7 @@ assign_prs:
 
 assign_prs_by:
 - labels:
-  - "api: asset"
+  - "api: cloudasset"
   to:
   - GoogleCloudPlatform/cloud-asset-analysis-team
   - GoogleCloudPlatform/cloud-asset-platform-team
@@ -100,4 +100,4 @@ assign_prs_by:
 - labels:
   - 'api: contentwarehouse'
   to:
-  - GoogleCloudPlatform/googleapis-contentwarehouse
+  - GoogleCloudPlatform/googleapis-contentwarehouse