Step down from security group

[jfb]

Summary

Propose Ahmed as a replacement. He's fixed many security issues in LLVM for Apple in the last few years, as such he'll fit the "Individual contributors" description.

[mattdr]

And now his watch is ended. Thank you for getting this started!

[jfb]

I'll wait 5 days to do this, since our process says:

If a nomination for LLVM Security Group membership is supported by a majority of existing LLVM Security Group members, then it carries within five business days unless an existing member of the Security Group objects. If an objection is raised, the LLVM Security Group members should discuss the matter and try to come to consensus; failing this, the nomination will succeed only by a two-thirds supermajority vote of the LLVM Security Group.

I have notified other members of the security group about this over email.

llvm/docs/Security.rst

 Group Composition
 =================
 
 Security Group Members
 ----------------------
 
 The members of the group represent a wide cross-section of the community, and meet the criteria for inclusion below.
 
+* Ahmed Bougacha (Apple)
 * Akila Srinivasan (Apple)
 * Dimitry Andric (individual; FreeBSD)
 * Ed Maste (individual; FreeBSD)
-* JF Bastien (Apple)
 * Josh Eads (Sony)
 * Kristof Beyls (ARM)
 * Matthew Riley (Google)
 * Oliver Hunt (Apple)
 * Paul Robinson (Sony)
 * Peter Smith (ARM)
 * Philip Reames (Azul Systems Inc)
 * Pietro Albini (individual; Rust)