[test][prefix] Update toolchain to follow the latest and fixed schema

The loops entry for representation was removed.

Check beat.core!105 for more information.
4 jobs for fix_toolchains in 8 minutes and 30 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #185085
docker-build
build_linux_36

00:02:42

55.0%
passed #185086
docker-build
build_linux_37

00:02:39

55.0%
passed #185083
macosx
build_macosx_36

00:08:30

55.0%
passed #185084
macosx
build_macosx_37

00:08:22

55.0%