Upgrade futures-macro to 0.3.26 am: af43963a44 am: 409bdbbd7d

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/futures-macro/+/2438873

Change-Id: Id35644cd16dfe71899a637eab4dd50842e423cdb
Signed-off-by: Automerger Merge Worker <[email protected]>