v21.2.18
refactor(devtools): Add a new childSignalProp DebugSignalGraphNode kind to represent a signal being passed to a child component as a prop.
refactor(devtools): use `whenStable` instead of `detectChanges`
build: format md files
refactor: update license text to point to angular.dev (#57901)
refactor(devtools): prepare codebase for migration to angular/angular repo