[roll] Roll fuchsia [coverage] Fix html and lcov exporting

When passing both `--lcov-output-path` and `--html-output-dir`
`ffx coverage` was ignoring the former.

This CL fixes the described bug.

Original-Bug: 117500
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/783826
Original-Revision: 20974b49a8f9ba22df492b177b2a54a390007035
GitOrigin-RevId: fd33f220ee65cd5bf245d3513d9ee998f4c06e56
Change-Id: I4dd51e66dcd1cd5649a967832d34c5343f86a7f7
diff --git a/stem b/stem
index 308e776..ea371e0 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="0b09d01267181216ffc7b1e455e59bfa8d4d7305"/>
+             revision="20974b49a8f9ba22df492b177b2a54a390007035"/>
   </projects>
   <hooks>
     <hook name="install-environment"