dev-lang/rust: upgrade to Rust 1.48.0

This CL is created by rust_uprev tool automatically.
BUG=chromium:1151315
TEST=Use CQ to test the new Rust version

Change-Id: I697c3766435a5c2c1e60d18fe5a56e3600aea1d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2634263
Reviewed-by: Bob Haarman <inglorion@chromium.org>
Tested-by: Bob Haarman <inglorion@chromium.org>
26 files changed