Warning in composer.json

[Flyingmana]

Steps to reproduce (*)

composer validate
./composer.json is valid, but with a few warnings
See https://getcomposer.org/doc/04-schema.md for details on the schema
extra.branch-alias.dev-main : the target branch (1.9.4.x) must end in -dev

additionally packagist reports the following:

Skipped branch 1.9.4.x, Invalid package information:
extra.branch-alias.dev-main : the target branch (1.9.4.x) must end in -dev

the problem was introduced by #1160

Expected result (*)

no warning

we should probably also check the actions check, to make sure warnings also trigger a failed build.

[sreichel]

For composer its just a warning, but it seems to break packist.org repo completly. I'wasn't able do download any version today.