Use the new golang version 1.21.3 (#3087)

Signed-off-by: Shubhendu Ram Tripathi <shubhendu@minio.io>

.github/workflows/vulncheck.yaml

@@ -22,7 +22,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v3
         with:
-          go-version: 1.21.1
+          go-version: 1.21.3
           check-latest: true
       - name: Get official govulncheck
         run: go install golang.org/x/vuln/cmd/govulncheck@latest
@@ -36,7 +36,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go-version: [1.21.1]
+        go-version: [1.21.3]
         os: [ubuntu-latest]
     steps:
       - name: Check out code