Update SECURITY.md to remove sec email

The sec email is getting deprecated, removing references to it.

SECURITY.md

@@ -12,20 +12,12 @@ below.
 **Please do not report (potential) security issues through public GitHub issues.**
 
 Instead please report them through our responsible disclosure program.
-We are currently operating an invite-only bug bounty with Intigriti. In
-order to participate, please register with Intigriti
-(https://login.intigriti.com/account/register). Then send an email to us at
-[email protected] with your @intigriti.me email address. We will then
-invite you to our bounty program. Once onboard, you will be able to review
-our bounty terms and scope, and safely share your findings with the team.
-
-Alternatively, you can report them directly to our security team via
-**[[email protected]](mailto:[email protected])**. If possible, please
-encrypt the message with our PGP key. You can find it here:
-https://keys.openpgp.org/vks/v1/by-fingerprint/C921305FC1B574C16533ACA4B3E23F29B4B09BE1
-
-Please include the information listed below to help us better understand and
-address the issue:
+We are currently operating a registered (public with an Intigriti account) bug bounty program with Intigriti.
+In order to participate, please register with Intigriti (https://login.intigriti.com/account/register).
+Then go to the following link and apply (https://app.intigriti.com/researcher/programs/personio/personio/).
+Once onboard, you will be able to review our bounty terms and scope, and safely share your findings with the team.
+
+Please include the information listed below to help us better understand and address the issue:
 
 - Your name and affiliation (if any).
 - The type of the issue (e.g. XSS, SQLi, buffer overflow, etc.).