Fix workflow branches

.github/workflows/ci.yml

@@ -2,7 +2,7 @@ name: CI
 on:
     pull_request:
         types: [opened, synchronize]
-        branches: [main]
+        branches: [master]
         paths: ['src/**', 'tests/**']
     workflow_dispatch:
 

.github/workflows/concat_cacerts.yml

@@ -1,7 +1,7 @@
 name: Concatenate CA certificates
 on:
     push:
-        branches: [main]
+        branches: [master]
         paths: ['cacerts/**']
     workflow_dispatch:
 

.github/workflows/update_ota_pr.yml

@@ -2,7 +2,7 @@ name: Update OTA PR
 on:
     pull_request:
         types: [opened, synchronize, reopened, edited, closed]
-        branches: [main]
+        branches: [master]
         paths: ['images/**']
 
 permissions: