[roll] Roll third_party/go [fidl][go] Attach correct body to head

There is currently an issue where a header can indicate
that the body contains V2 bytes, but the body's context
will indicate to the encoder to write V1 bytes.

Original-Bug: 80348

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/go/+/571101
Original-Revision: 5c491566c92ad885f4f4c7a631f9ddffe36be1c4
GitOrigin-RevId: 5162c7492c06afc994c8750065f0dcc161c2f52d
Change-Id: I23f81fc767739f87c6d1cdb8a7c2b89f1da706e8
diff --git a/third_party/flower b/third_party/flower
index 9c52946..2abe9c3 100644
--- a/third_party/flower
+++ b/third_party/flower
@@ -133,7 +133,7 @@
     <project name="third_party/go"
              remote="https://fuchsia.googlesource.com/third_party/go"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="d77d10f42dcc916122983a8471b8bad46be1c5b9"
+             revision="5c491566c92ad885f4f4c7a631f9ddffe36be1c4"
              path="third_party/go"/>
     <project name="third_party/github.com/intel/intel-linux-processor-microcode-data-files"
              path="third_party/github.com/intel/intel-linux-processor-microcode-data-files"