update env variables

Author: paulacamargo25

build/azure-pipeline.pre-release.yml

@@ -89,8 +89,8 @@ extends:
         displayName: Install libraries
         env:
           npm_config_arch: ${{ variables.packageArch }}
-          parameters: ${{ parameters }}
-          variables: ${{ variables }}
+          parameters: ${{ convertToJson(parameters) }}
+          variables: ${{ convertToJson(variables) }}
 
       - script: python ./build/update_ext_version.py --for-publishing
         displayName: Update build number