Update manifest merger to 31.8.0-alpha08

./import-maven-artifacts.sh com.android.tools.build:manifest-merger:31.8.0-alpha08

Bug: 376130161
Test: treehugger
Change-Id: I1dbf7c631e64d94a390360126e1dacdee0991c04
146 files changed
tree: dd6d6cafe98986b31ffababe449e555e5cd7f08d
  1. com/
  2. Android.bp
  3. import-maven-artifacts.sh