Replace default branch name with main

.github/workflows/ci.yml

@@ -1,6 +1,6 @@
 on:
-  push: {branches: master}
-  pull_request: {branches: master}
+  push: {branches: main}
+  pull_request: {branches: main}
 
 jobs:
   ci:

.github/workflows/integration.yml

@@ -1,12 +1,12 @@
 on:
-  push: {branches: master}
+  push: {branches: main}
 
 jobs:
   integration:
     runs-on: ubuntu-latest
     steps:
       - id: output-set
-        uses: actions/github-script@master
+        uses: actions/github-script@main
         with:
           script: return core.getInput('input-value')
           result-encoding: string

.github/workflows/pull-request-test.yml

@@ -1,6 +1,6 @@
 on:
   pull_request:
-    branches: master
+    branches: main
     types: [opened, synchronize]
 
 jobs: