[roll] Roll fuchsia [driver2] Migrate to LLCPP result callbacks

See https://groups.google.com/a/fuchsia.dev/g/fidl-dev/c/peLGiIKrufQ

LLCPP now has the ability to notify send-time errors together with any
other error during the call in the two-way async callback. The result
callback avoids racy errors that happen while the call is in-flight.

Original-Bug: 75324
Test: fx test -vo driver2-tests
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/572013
Original-Revision: f1d6cd5cd360845b99afc0560fabfbc5828f3537
GitOrigin-RevId: 2b2a67153ef76e105e211e054f25e1eaf44b8b7c
Change-Id: I877724d9c39701acf3bd039d17b550ae4c444b91
diff --git a/stem b/stem
index 8fbc213..5bfbf03 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
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-             revision="6195b064113eefa9ef2c329acc4e207768865cb1"/>
+             revision="f1d6cd5cd360845b99afc0560fabfbc5828f3537"/>
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