.github/ISSUE_TEMPLATE: remove 02-security.yml

GitHub now provides a default template.

https://docs.github.com/en/code-security/security-advisories/repository-security-advisories/configuring-private-vulnerability-reporting-for-a-repository

.github/ISSUE_TEMPLATE/02-security.yml

@@ -1,31 +0,0 @@
-name: Security Vulnerability
-description: Provide details about a security vulnerability.
-labels: security
-body:
-- type: checkboxes
-  id: os
-  attributes:
-    label: Operating System
-    options:
-      - label: Windows
-      - label: macOS
-      - label: Linux
-      - label: FreeBSD
-      - label: OpenBSD
-      - label: Android
-      - label: iOS
-      - label: Nintendo Switch
-      - label: Xbox
-      - label: Web Browsers
-  validations:
-    required: true
-- type: textarea
-  id: what
-  attributes:
-    label: What vulnerability have you discovered? Include any relevant details like a CVE.
-  validations:
-    required: true
-- type: textarea
-  id: why
-  attributes:
-    label: What remediation steps are known, if any.