2.6.1243

• Address #558 by adding :patch-into (and patch-into helper) for XTDB (but in core).
• Address #556 by adding an XTDB section to the documentation with examples.
• Address #555 by supporting SETTING clause for XTDB.
• Replace assert calls with proper validation, throwing ex-info on failure (like other existing validation in HoneySQL).
• Experimental :xtdb dialect removed (since XTDB no longer supports qualified column names).
• Update dev/test deps.