Add spacing between the properties of the key (#20145)

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

Author: Gusted

SECURITY.md

@@ -11,12 +11,12 @@ Please **DO NOT** file a public issue, instead send your report privately to `se
 
 Due to the sensitive nature of security information, you can use below GPG public key encrypt your mail body.
 
-The PGP key is valid until June 24, 2024.
-Key ID: 6FCD2D5B
-Key Type: RSA
-Expires: 6/24/2024
-Key Size: 4096/4096
-Fingerprint: 3DE0 3D1E 144A 7F06 9359  99DC AAFD 2381 6FCD 2D5B
+The PGP key is valid until June 24, 2024.  
+Key ID: 6FCD2D5B  
+Key Type: RSA  
+Expires: 6/24/2024  
+Key Size: 4096/4096  
+Fingerprint: 3DE0 3D1E 144A 7F06 9359 99DC AAFD 2381 6FCD 2D5B  
 UserID: Gitea Security <security@gitea.io>
 
 ```