Fix branch configuration for GitHub Actions workflow

.github/workflows/codeql.yml

@@ -2,10 +2,10 @@ name: "CodeQL"
 
 on:
   push:
-    branches: [ 'main' ]
+    branches: [ '6.3' ]
   pull_request:
     # The branches below must be a subset of the branches above
-    branches: [ 'main' ]
+    branches: [ '6.3' ]
   schedule:
     - cron: '34 11 * * 4'
 

.github/workflows/contributor-build.yml

@@ -9,10 +9,10 @@ name: Hibernate ORM build
 on:
   push:
     branches:
-      - 'main'
+      - '6.3'
   pull_request:
     branches:
-      - 'main'
+      - '6.3'
       
 permissions: {} # none