Update Diomede version.

Update W3C test harness code.

Updates and fixes to align with Xcode 16 beta.

Update to SPARQLSyntax 1.2 with fix for COUNT(DISTINCT *) algebra rep…

…resentation.

Updated minor version of URITemplate dependency.

Improve error reporting for SPARQL XML parsing.

Fix conneg handling for SPARQL-JSON responses with explicit encoding.

Fix bug in SPARQLContentNegotiator.

Replaced workaround code with generic XCTestCase abstract class with …

…concrete subclasses.

Fix bug in query planner handling of nested loop joins.