[roll] Roll fuchsia [fidl][fix] Create protocol modifier fix

This creates a new automated fix for adding the appropriate unknown
interaction modifiers to protocol and method declarations. The next CL
in the chain will further test this functionality by creating the
top-level fidl-fix binary, and test running it on some subset of the
entire *.fidl corpus in fuchsia.git.

Test: fx test fidl-test
Original-Bug: 114357, 88366
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/769087
Original-Revision: a6a2ccbf78877349c2fa783f6b67c869efa0dfb4
GitOrigin-RevId: 9316d07f9cf1ee705724ea94a7a8cf952e4835a8
Change-Id: I1b1c2ec02057635ec8a4c22eb09b88cb57a7adb6
diff --git a/stem b/stem
index f8cda5d..b859bae 100644
--- a/stem
+++ b/stem
@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="bff300df9259cd685882862f2688cbbf6a3d7fbe"/>
+             revision="a6a2ccbf78877349c2fa783f6b67c869efa0dfb4"/>
   </projects>
   <hooks>
     <hook name="install-environment"