github-ci: update go version to 1.21

Signed-off-by: Raghavendra Talur <[email protected]>

.github/workflows/ci.yaml

@@ -23,7 +23,7 @@ env:
   IMAGE_NAME: ${{ vars.IMAGE_NAME || 'ramen' }}
   OPERATOR_SUGGESTED_NAMESPACE: ${{ vars.OPERATOR_SUGGESTED_NAMESPACE || 'ramen-system' }}
   # Constants
-  GO_VERSION: "1.19"
+  GO_VERSION: "1.21"
   IMAGE_REGISTRY: "quay.io"
   IMAGE_TAG: "ci"
   DOCKERCMD: "podman"
@@ -39,6 +39,11 @@ jobs:
       - name: Checkout source
         uses: actions/checkout@v3
 
+      - name: Setup go
+        uses: actions/setup-go@v4
+        with:
+          go-version: ${{ env.GO_VERSION }}
+
       - name: Install prereqs
         run: |
           echo 'APT::Acquire::Retries "5";' | sudo tee /etc/apt/apt.conf.d/80-retries