Added huggingface emoji instead of the markdown format (#27091)

Added huggingface emoji instead of the markdown format as it was not displaying the required emoji in that format

SECURITY.md

@@ -2,5 +2,5 @@
 
 ## Reporting a Vulnerability
 
-:hugging_face: We have our bug bounty program set up with HackerOne. Please feel free to submit vulnerability reports to our private program at https://hackerone.com/hugging_face.
+🤗 We have our bug bounty program set up with HackerOne. Please feel free to submit vulnerability reports to our private program at https://hackerone.com/hugging_face.
 Note that you'll need to be invited to our program, so send us a quick email at security@huggingface.co if you've found a vulnerability.