[horde] Switch from || dev-FRAMEWORK_6_0 to branch aliases

[Ralf Lang]

Hello,

tonight and tomorrow all libraries which haven't had a release lately get a
formal release for metadata upgrade.

We are changing our approach to composer.
All releases get a branch-alias.
This means any component CONSUMING that package doesn't need to declare ||
dev-FRAMEWORK_6_0 in the dependency.

It is sufficient to just set

composer config minimum-stability dev

if you want development versions or minimum-stability alpha to switch back
to released tags.
Also many components will switch to "beta" stability.

For a while we will do both but eventually we will drop the ||
dev-FRAMEWORK_6_0 stuff.

You can still edit your root composer.json to explicitly allow that branch
for components which have not yet seen an update.

Regards

Ralf