sonic-buildimage has no main branch. (#310)

fixes the github-manager errors present for months.

Signed-off-by: Felix Kronlage-Dammers <fkr@hazardous.org>

Author: fkr

orgs/SovereignCloudStack/repositories/sonic-buildimage.yml

@@ -1,6 +1,6 @@
 ---
 sonic-buildimage:
-  default_branch: main
+  default_branch: master
   description: 'A fork of the offical sonic repo'
   homepage: 'https://scs.community/'
   topics: