rust_uprev: also uprev rust-bootstrap

Since crrev.com/c/2436432, dev-lang/rust requires
dev-lang/rust-bootstrap to build. Because of this,
rust uprevs now require that rust-bootstrap be uprevved,
too. This CL changes the rust_uprev script to do so.

BUG=chromium:1159066
TEST=python3 ./rust_tools/rust_uprev_test.py

Change-Id: I48482e780d9ebbc012142687f2edfcc8f83e9d56
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/2597493
Commit-Queue: Bob Haarman <inglorion@chromium.org>
Tested-by: Bob Haarman <inglorion@chromium.org>
Reviewed-by: George Burgess <gbiv@chromium.org>
2 files changed