Update branch name to main

Author: StevenMaude

.github/workflows/ci-build.yml

@@ -2,7 +2,7 @@ name: CI
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
 
 jobs:

.github/workflows/codeql-analysis.yml

@@ -7,10 +7,10 @@ name: "CodeQL"
 
 on:
   push:
-    branches: [master]
+    branches: [main]
   pull_request:
     # The branches below must be a subset of the branches above
-    branches: [master]
+    branches: [main]
   schedule:
     - cron: '0 3 * * 5'