replace an empty optionalDependencies placeholder instead of invalid $deps json

Author: porsager

.github/workflows/release.yml

@@ -66,7 +66,7 @@ jobs:
           done
           deps=${deps%,*}
 
-          sed -i "s|\$deps|$deps|" package.json
+          sed -i "s|\"optionalDependencies\": {}|\"optionalDependencies\": {\n  $deps\n}|" package.json
           sed -i "s|\"version\": \"[^\"]*\"|\"version\": \"${version}\"|g" package.json
 
           git checkout --detach