building dojo project no longer generates output files after update to 1.17

In our product, we use the dojo build to deploy a number of layers, which are optimized using the closure compiler.
After updating to 1.17 we find that, while it does produce the `.consoleStripped.js` and `.uncompressed.js` output files, the actually optimized files are no longer generated.

Please note that we already (locally) upgraded the closureCompiler to version 20210601 to allow us to use the newer style JavaScript syntax. Just swapping the 1.17.3 version with this older version fixes the problem of the generated output files.