Update morello toolchain manifest for llvm 13.

This makes the manifest the same as the one used to build AOSP
toolchain r433403.

Change-Id: I06cedcc6ac9f82d415f78a886f34f75e5e07963b
16 jobs for !18 with patch-213701 in 10 seconds (queued for 2 seconds)
latest detached
Status Job ID Name Coverage
  Build Stage1
canceled #86601
allowed to fail
build-and-test-cheribsd

00:00:08

canceled #86602
build-firmware

00:00:08

canceled #86600
arm64_fast
build-musl

00:00:10

canceled #86599
build-toolchain

00:00:08

 
  Build Stage2
canceled #86604
build-android-nano

canceled #86603
build-android-swr

canceled #86605
build-busybox

 
  Generate Test
canceled #86606
generate-test

 
  Test
canceled test

canceled #86611
arm64_fast
test-musl

canceled #86608
arm64
test-tuxsuite-android-swr-boottest

canceled #86609
arm64
test-tuxsuite-busybox

canceled #86610
arm64
test-tuxsuite-ubuntu

 
  Report To Trigger
canceled #86613
report_failure

canceled #86612
report_success

 
  Publish Artifacts
canceled #86614
publish_artifacts