replace labels with issue type

see https://github.blog/changelog/2025-01-13-evolving-github-issues-public-preview/#organize-your-work-with-issue-types
[ci skip]

.github/ISSUE_TEMPLATE/bug.yml

@@ -1,6 +1,6 @@
 name: Bug Report
 description: Create a report to help us improve
-labels: ["type:bug"]
+type: "Bug"
 body:
   - type: input
     id: summary

.github/ISSUE_TEMPLATE/feature.yml

@@ -1,6 +1,6 @@
 name: Feature Request
 description: Suggest an idea for this project
-labels: ["type:feature-request"]
+type: "Feature"
 body:
   - type: input
     id: summary