Allow to install "knplabs/knp-paginator-bundle:^5.0"

[phansys]

The changes between version 4 and 5 seem fully compatible with the features that we implement:

• https://github.com/KnpLabs/KnpPaginatorBundle/releases/tag/v5.0.0
• https://github.com/KnpLabs/KnpPaginatorBundle/compare/v4.1.0...v5.0.0