Update mvfst submodule ref

mszabo-wikia · mszabo-wikia · commit 142aeba37b99 · 2025-10-09T13:16:14.000-04:00
diff --git a/third-party/mvfst/src b/third-party/mvfst/src
@@ -1 +1 @@
-Subproject commit 57bf5ac97e9a9c347a781912b468909f600188d7
+Subproject commit f686ab0f4c9ab3637a2bcc087adf5e81e07c51c8
