Update default branch name to main

Author: jdalton

.github/workflows/ci.yml

@@ -3,12 +3,12 @@ name: CI
 on:
   push:
     branches:
-      - master
+      - main
     tags:
       - '*'
   pull_request:
     branches:
-      - master
+      - main
 
 permissions:
   contents: read

.github/workflows/generate.yml

@@ -3,7 +3,7 @@ name: Sync SDK
 on:
   push:
     branches:
-      - master
+      - main
   schedule:
     # At 06:37 on every day-of-week from Monday through Friday.
     - cron: '37 6 * * 1-5'

.github/workflows/types.yml

@@ -3,12 +3,12 @@ name: Type Checks
 on:
   push:
     branches:
-      - master
+      - main
     tags:
       - '*'
   pull_request:
     branches:
-      - master
+      - main
   schedule:
     - cron: '14 5 * * 1,3,5'