Force IPv4 when downloading in fix_gradle_deps.py

Our build servers have a lot of difficulties to reach to maven.mozilla.org over IPv6 (tpo/tpa/team#41654 (closed)).

So, I want to update tools/fix_gradle_deps.py to avoid using IPv6.

added Android Build System Doing Task labels

assigned to @pierov

mentioned in merge request !989 (merged)

added 13.5 stable 14.0 stable Backport FF128-esr labels

removed 13.5 stable label

removed FF128-esr label

added 14.5 stable label

marked this issue as related to #41186 (closed)

removed 14.5 stable label

removed Backport label

removed Doing label

I would not backport this, as it's a helper script devs can optionally use.

closed