Add S-triage auto-label.

Author: ehuss

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -1,6 +1,6 @@
 name: Bug Report
 description: Create a report to help us improve
-labels: ["C-bug"]
+labels: ["C-bug", "S-triage"]
 body:
   - type: markdown
     attributes:

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -1,6 +1,6 @@
 name: Feature Request
 description: Suggest an idea for enhancing Cargo
-labels: ["C-feature-request"]
+labels: ["C-feature-request", "S-triage"]
 body:
   - type: markdown
     attributes: