Update libraries

[And96]

Please update to http ^1.1.0 available on pub.dev since some months

This will solve incompatibility with many new library that are based on new http version.

Because every version of metadata_fetch_plus depends on http ^1.1.0 and aggregator_news depends on http ^0.13.6, metadata_fetch_plus is forbidden.

[And96]

Because feed_finder 1.0.9 depends on http ^0.13.0 and no versions of feed_finder match >1.0.9 <2.0.0, feed_finder ^1.0.9 requires http ^0.13.0. So, because aggregator_news depends on both feed_finder ^1.0.9 and http ^1.1.0, version solving failed.