Merge "Upgrade markdown to 3.4.1" am: 79292f57ff am: 15d05f2d07 am: 41abd71417

Original change: https://android-review.googlesource.com/c/platform/external/markdown/+/2288233

Change-Id: Ieca29d1e12802f580116844c0b5f1770313569c0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>