Update tokio-macros to v2.1.0 am: 98c70049ec am: f2dded784d am: 5b613f0388

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/tokio-macros/+/2813218

Change-Id: I0fca1546f6a52f7d2a86fea454e7ed55f64f9a13
Signed-off-by: Automerger Merge Worker <[email protected]>