[ignore] Update release workflow go version to 1.21

Author: lhercot

.github/workflows/release.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v4
         with:
-          go-version: '1.20'
+          go-version: '1.21'
 
       - name: Import GPG key
         id: import_gpg