Update dependency ds-caselaw-marklogic-api-client to v18

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ds-caselaw-marklogic-api-client	17.3.0 -> 18.0.0

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Release Notes

nationalarchives/ds-caselaw-custom-api-client (ds-caselaw-marklogic-api-client)

v18.0.0

Compare Source

• Breaking: Fully remove the deprecated caselawclient.api_client instance.
• Breaking: Remove top-level methods for interacting with a document's XML representation. These are now all encapsulated in document.xml, which is an instance of Document.XML.
• Feature: New Document.xml_root_element function to replace get_judgment_root
• Feature: Documents which are not valid XML are now identified by the raising of a new Document.NonXMLDocumentError exception
• Feature: Add method to return document's lock status and message.

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