migrate to main in ci.yml

.github/workflows/ci.yml

@@ -3,9 +3,9 @@ name: CI
 on:
   push:
     tags: [ v* ]
-    branches: [ master ]
+    branches: [ main ]
   pull_request:
-    branches: [ master ]
+    branches: [ main ]
 
 jobs:
 
@@ -21,7 +21,7 @@ jobs:
       id: go      
 
     - name: Check out code into the Go module directory
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         fetch-depth: 0
 
@@ -45,7 +45,7 @@ jobs:
       id: go
 
     - name: Check out code into the Go module directory
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         fetch-depth: 0