ci: Move go setup to befre checkout

.github/workflows/main.yml

@@ -15,11 +15,11 @@ jobs:
         go-version: [ '1.21.6' ]
 
     steps:
-      - uses: actions/checkout@v4
       - name: Setup Go
         uses: actions/setup-go@v4
         with:
           go-version: ${{ matrix.go-version }}
+      - uses: actions/checkout@v4
       - name: Install dependencies
         run: go get .
       - name: Test with Go