Update AppEngine uploader app jar

[ggalmazor]

This PR updates the AppEngine Uploaded app JAR that the installer uses to deploy Aggregate to AppEngine.

The new uploader includes getodk/aggregate-components#5 to avoid problems due to the deprecation of the AppEngine Backends API by Google.

[yanokwa]

This PR itself is fine, but how were the changes in getodk/aggregate-components#5 verified? Specifically, can you confirm that

1. The current installer doesn't work (as described at https://forum.opendatakit.org/t/18605) on a new GAE project.
2. This installer does work on that project.

[ggalmazor]

Sure!

• I've verified that the official v1.7.1 won't complete the upload to AppEngine (complaining about the backends api)
• I've verified that the new uploader works :)

I had to replace (again) the uploader jar. The PR is fine as far as I know :)

[yanokwa]

LGTM.

[yanokwa]

@ggalmazor How do you want to handle testing this?

[kkrawczyk123]

I've checked: install generating, running and GAE installing process without any problems on Ubuntu.

@opendatakit-bot unlabel "needs testing"
@opendatakit-bot label "behavior verified"

[ggalmazor]

Thanks! I think we can do a pint release v1.7.2 :)

[yanokwa]

Point release or pint release? 🍺