Update main.yml

Update actions/checkout from v2 to v3 to resolve node EOL issue.
Update actions/setup-go from v2 to v4 for improved Go features

Author: chris-bateman

.github/workflows/main.yml

@@ -16,10 +16,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out code into the Go module directory
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Setup go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v4
         with:
           go-version: '1.20.x'