ci: use go 1.18 for release

Author: reinoudk

.github/workflows/release.yaml

@@ -17,7 +17,7 @@ jobs:
 
       - uses: actions/setup-go@v3
         with:
-          go-version: '1.17'
+          go-version: '1.18'
 
       - name: Import GPG key
         id: import_gpg