Update manifest merger to 31.9.0-alpha03 am: 27d32dc537 am: 3666805be6

Original change: https://android-review.googlesource.com/c/platform/prebuilts/manifest-merger/+/3378551

Change-Id: I943d98563e3f1c2e18561e8fdbbf56c13a6ce55e
Signed-off-by: Automerger Merge Worker <[email protected]>
tree: 0faf07ffc56a1677d55f54153aee6a4d35126d6b
  1. com/
  2. Android.bp
  3. import-maven-artifacts.sh