Update actions/checkout from v1 to v2 (#1134)
Update actions/checkout from v1 to v2 (#1134)

Update the version of the checkout action in Github CI runner.

Signed-off-by: Emily Mabrey <3d36c4a9b71c8057f58fe5b123154f7eebd91aac@gmail.com>
mozilla/sccache,mozilla/sccache,mozilla/sccache