Update manifest merger to 31.2.0-alpha08 am: 0d2d666b4c am: 067175ac21 am: c6e6375337 am: ed5d5b9a19 am: 4600602505

Original change: https://android-review.googlesource.com/c/platform/prebuilts/manifest-merger/+/2635208

Change-Id: I3ce4b2356c0e27dd9f47f56d9f7280e5a5380edb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>