[copybara] Zero out high churn 'repo_url' in .toml files

[pjreiniger]

This is a high churn change whenever mostrobotpy switches from pointing to release-2027 to development-2027. The value isn't used by the bazel build scripts, so there is no reason to have a zero impact change on ~11 files muddying up the synchronization diffs.

In the allwpilib -> mostrobotpy direction, we update this config file and run this script which updates it in that repo during.

I manually did this change in #8503, but this will do it automatically in the future