test: update Kokoro to use main branch #7167
Merged
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Description
Updates default branch reference to
mainbranch. Separating this PR to debug easier if we run into any issues.Googlers see cl/412994041 which updates the Kokoro configs.
Fixes #7153.
Checklist
nox -s py-3.6(see Test Environment Setup)nox -s lint(see Test Environment Setup)