Fixup workflows after master->main rename

.github/workflows/ci.yml

@@ -1,13 +1,13 @@
 on:
   # Trigger the workflow on push or
   # pull request, but only for the
-  # master branch.
+  # main branch.
   push:
     branches:
-      - master
+      - main
   pull_request:
     branches:
-      - master
+      - main
   # Weekly run to account for
   # changed dependencies.
   schedule:

.github/workflows/codeql-analysis.yml

@@ -2,10 +2,10 @@ 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 5 * * 1'