lock_machine: remove python2 from call to swarming

swarming.py is being called with python2 which no longer exists in
chrotomation. This was being done becuase swarming.py did not support
python3 but this is no longer the case.

BUG=b:221777277
TEST=manually verified that call executes the write script

Change-Id: I2ec50a6f10b597ac7ca0a478e83eb9e2a5e3bb5e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/3514287
Commit-Queue: George Burgess <gbiv@chromium.org>
Tested-by: George Burgess <gbiv@chromium.org>
Reviewed-by: George Burgess <gbiv@chromium.org>
1 file changed