* XRPLF/ximinez/lending-refactoring-4:
refactor: Modularise ledger (5493)
chore: Add unit tests dir to code coverage excludes (5803)
chore: Build and test all configs for daily scheduled run (5801)
chore: Limits CI build and test parallelism to reduce resource contention (5799)
fix(amendment): Add missing fields for keylets to ledger objects (5646)
Rename mutable flags (5797)
Set version to 2.6.1-rc1
Downgrade to boost 1.83
Set version to 2.5.1
Fix: Don't flag consensus as stalled prematurely (5658)