Update maven version used to 3.9.4

Version 3.9.2 is no longer available.

Bug: 300081840
Test: ./update-metalava-lint-deps.sh 31.3.0-alpha06 300081840
Change-Id: I8bf7b035820a7313644cb73d6a6c585b7b039bb2
1 file changed
tree: 7f9e1040e1b92b0d61e9db1cf660ce063e4dab59
  1. com/
  2. .gitignore
  3. Android.bp
  4. METADATA
  5. update-metalava-lint-deps.sh