Update dependency org.carrot2:carrot2-core to v4.6.0

[solrbot]

This PR contains the following updates:

Package	Type	Update	Change
org.carrot2:carrot2-core (source)	dependencies	minor	4.5.1 -> 4.6.0

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[cpoerschke]

https://carrot2.github.io/release/4.5.3/doc/v4.5.x/#v4.5.3

[janhoy]

https://carrot2.github.io/release/4.5.3/doc/v4.5.x/#v4.5.3

Carrot goes to Jetty11 in this release, does that even matter for our use so we should wait until Solr is also on Jetty 11?