Update QEMU maintainers (#14934)

Author: oliverchang

projects/qemu/project.yaml

@@ -2,8 +2,6 @@ homepage: "https://www.qemu.org/"
 language: c
 primary_contact: "alxndr@bu.edu"
 auto_ccs:
-  - "bsd@redhat.com"
-  - "mcascell@redhat.com"
   - "pbonzini@redhat.com"
   - "stefanha@redhat.com"
   - "darren.kenny@oracle.com"