Update go version in workflow (#19)

Author: locus313

.github/workflows/scheduled-test.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.20'
+          go-version: '1.21'
 
       - name: Configure AWS Credentials
         uses: aws-actions/configure-aws-credentials@v4