[roll] Roll fuchsia [sdk] Migrate fuchsia_async macros

Migrate fuchsia_async macro usages to top-level fuchsia macro
attributes to standardize async test and main entrypoints.

Original-Original-Bug: 541148781
Test: fx build
TAG: agy
CONV: 14b10194-b446-4c31-926a-fba99aa8e150
Original-Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1735812
Original-Original-Revision: 7d42341045fc161f9c63de0da6e09f0ddcd5278b
GitOrigin-RevId: 9796567ead9e6512c5862dc1b8719301ac08c208
Change-Id: Icba2c5fc550c01aebaee288d85139436b1eccd95
Reviewed-on: https://fuchsia-review.googlesource.com/c/integration/+/1737129
Cr-Commit-Position: refs/heads/main@{#198316}

stem

diff --git a/stem b/stem
index f31fa17..3883c6e 100644
--- a/stem
+++ b/stem
@@ -8,6 +8,6 @@
             manifest="manifests/platform"
             root=""
             remote="https://fuchsia.googlesource.com/fuchsia"
-            revision="7d731dd39c6f41e0543789895989c113fd8581b5"/>
+            revision="7d42341045fc161f9c63de0da6e09f0ddcd5278b"/>
   </imports>
 </manifest>