Update SECURITY.md

Co-authored-by: neverland <[email protected]>

Author: hardfist

SECURITY.md

@@ -1,5 +1,5 @@
 # Security
-## Reporting a security bug in Rspack
+## Reporting a vulnerability in Rspack
 Report security bugs in Rspack via [email protected].
 
 Normally, your report will be acknowledged within 24 hours, and you'll receive a more detailed response to your report within 5 days indicating the next steps in handling your submission.