[roll] Roll fuchsia [overnet] Remove std::forward on lvalue reference

llvm/llvm-project#120223 became more strict
about discarded value expressions. The current std::forward expressions
triggered a no-discard warning/error.

It seems like we can remove the `std::forward` on the lvalue reference
in these visitor functions anyway to resolve this error.

Original-Fixed: 385748190
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1179435
Original-Revision: f5151dcdb438a72b806da2dd8efdf1dcefe45583
GitOrigin-RevId: 1da2bddea99f38cf500975599e0a17cf1e649236
Change-Id: I053bca01ca47a110a9e3ccd29d3c8ce19f7588ef

Author: Caslyn Tonelli

stem

@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="f9d86a012006675df39fffb381f9796725e8ab34"/>
+             revision="f5151dcdb438a72b806da2dd8efdf1dcefe45583"/>
   </projects>
   <hooks>
     <hook name="install-environment"