Switch Secure Boot key for AlmaLinux 9 Beta flavor

Author: andrewlukoshko

reference_data/platform_flavors.yaml

@@ -103,7 +103,7 @@
   data:
      mock:
        secure_boot_macros:
-         "%pe_signing_cert": '05'
+         "%pe_signing_cert": '06'
          "%pe_signing_token": 'AlmaLinux OS Foundation'
   repositories:
     - name: almalinux-9-beta