Remove Nokogiri as dependency
NB this release (and all previous releases after authority processing was added) are broken for use on the command line (although pipelines defined outside those specific use cases, and pipelines that don't use authority processing, will still work). Use v1.3.0 or later for authority processing.
Nokogiri dependency was only required to parse Solr schemas, which are available as JSON. Nokogiri, despite wide utility and support, can be difficult to install on aarch64/Arm platforms, particulary Graviton based EC2 instances on Amazon Linux 2022 (which do not yet ship a supported version of glibc (2.26 vs. 2.29 required -- see https://nokogiri.org/tutorials/installing_nokogiri.html#supported-platforms).
Full Changelog: v1.1.0...v1.2.0