chore(workflow): remove duplicated issue label (#9140)

Author: chenjiahan

.github/ISSUE_TEMPLATE/1-bug-report.en-US.yml

@@ -2,7 +2,7 @@ name: "🐞 Bug Report"
 description: Report a bug to Rspack
 title: "[Bug]: "
 type: Bug
-labels: ["bug", "pending triage"]
+labels: ["pending triage"]
 body:
   - type: markdown
     attributes:

.github/ISSUE_TEMPLATE/2-feature-request.en-US.yml

@@ -2,7 +2,7 @@ name: "✨ Feature Request"
 description: Submit a new feature request to Rspack
 title: "[Feature]: "
 type: Enhancement
-labels: ["feat", "pending triage"]
+labels: ["pending triage"]
 body:
   - type: markdown
     attributes: