Add changeset for set

.changeset/long-squids-report.md

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+---
+"@solid-primitives/set": minor
+---
+
+Fixes for ReactiveSet (#688):
+- Iterators and `.forEach()` no longer track specific keys.
+- Added support for `thisArg` as per `forEach` spec
+- `super.clear()` now called before dirtying signals
+- Uses new `dirtyAll` form trigger package